Sphalerite formula

1,072 (2017) 50.9km SSW. Copper mine. Located about 3.5 miles east of Greenwood, covering the old townsite of Phoenix. The geology of the Phoenix area is complex. The mine is underlain by an intricately folded, faulted, metamorphosed and mineralized sequence of Paleozoic and Mesozoic volcanic and sedimentary rocks that are overlain in turn by ...

Sphalerite formula. Oct 24, 2022 · Galena's chemical formula is PbS. This expresses that a lead sulfide molecule is composed of one lead (Pb) cation (positive ion) and one sulfur (S) anion. Each ion forms an octahedral structure by ...

... formula A rough colinearity with sphalerite and covellite is apparently maintained. The optical properties of this mineral are, by analogy with the Cu-Fe-S ...

Kuripshyne. 127 (2020) 7.7km SSE. The Mighei (CM2) meteorite was observed to fall on 18 Jun 1889. After both sounds and light, a single stone of mass ~ 8 kg was recovered. Mighei is the prototype for the CM (Mighei-like) Carbonaceous Chondrites. There are 15 known CM falls and over 400 recorded finds. Most CM meteorites are petrologic type CM2.Flamboro Quarry, West Flamborough Township, Hamilton, Ontario, Canada : Smaller pit on the west side of Brock Road. Located at 685 Brock Rd Dundas Ontario Note: the quarry is sometimes erroneously called 'Flamborough Quarry'.Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). It is the most important ore of lead and an important source of silver.. Galena is one of the most abundant and widely distributed sulfide minerals.It crystallizes in the cubic crystal system often showing octahedral forms. It is often associated with the minerals sphalerite, …Sphalerite is a mineral. Its is a mixed zinc and iron sulfide. The chemical formula is (Zn,Fe)S. It can be brown, yellow, red, green, and black. It is normally found with galena, …The chemical formula of sphalerite is (Zn,Fe)S. It is a zinc sulfide containing variable amounts of iron that substitutes for zinc in the mineral lattice. The iron content is normally less than 25% by weight.

Mineral List Mineral list contains entries from the region specified including sub-localities ⓘ AragoniteA 10 head mill had been installed. During its time the Ida H Company produced 106 911 ounces of gold from 225 596 tonnes of ore. Edmund Maddans was killed at the mine April 1912 from a fall of earth. Herbert O'Keefe, was timbering in the shaft in May 1914, slipped and fell 200 feet down the shaft to his death.Sphalerite and wurtzite are polymorphs. They share the same chemical formula (ZnS), but have different crystal habits. Sphalerite has an isometric crystal structure, while wurtzite has a hexagonal structure. These two minerals can coexist in alternating layers as schalenblende, a gem material used rarely for cabochons.It is often associated with the minerals sphalerite, calcite and fluorite. ... Pollucite is a zeolite mineral with the formula (Cs,Na) 2 Al 2 Si 4 O 12 ·2H 2 O with iron, calcium, rubidium and potassium as common substituting elements. It is important as a significant ore of caesium and sometimes rubidium. It forms a solid solution series with …Sphalerite keeps the energy flowing so that you can continue to pursue the things that make you happy. Its meaning encourages you to find your true calling and precisely determine what you’re meant to do on this planet. Sphalerite Uses. Sphalerite is just as versatile as many other popular healing crystals. There are many ways to use it in …

Sphalerite can be found in many ore veins of sulfide minerals, commonly associated with galena and pyrite. Miners call sphalerite "jack," "blackjack," or "zinc blende." Its impurities of gallium, indium and cadmium make sphalerite a major ore of those metals. Sphalerite has some interesting properties. It has excellent dodecahedral …Zinc sulfide (ZnS), a naturally occurring salt, is the main source of zinc. It has two common crystalline forms (polymorphs): Sphalerite (“zinc blende”), with a cubic crystal structure, is the form that predominates in nature. Wurtzite, with hexagonal crystals, is scarcer, but it can be made by heating sphalerite to ≈1020 ºC. 1.Sphericity could also be found from the formula, Sphericity (φ s) = 6 V p / (D p S p) Where V p = volume of particle. D p = Equivalent diameter of particle. (Equivalent diameter is defined as the diameter of a sphere of equal volume) S p = surface area of particle. V p = π r c 2 h = 2.356 cm 3. D p = 2 r s = 2 x 0.8255 = 1.651 cm. S p = 2 π ...Step 4: Substitute Coefficients and Verify Result. Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced. Since there is an equal number of each element in the reactants and products of Zn + S = ZnS, the equation is balanced.Jul 22, 2011 · Various models have been proposed to explain the formation mechanism of colloform sphalerite, but the origin is still under debate. In order to decipher influences on trace element incorporation and sulfur isotope composition, crystalline and colloform sphalerite from the carbonate-hosted Mississippi-Valley Type (MVT) deposit near Wiesloch, SW Germany, were investigated and compared to ...

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Reference: Schaub, W.J. (1994) A barite & sphalerite locality in Bath County, Central Kentucky. R&M 69(5):326-329.; Rocks & Minerals 81:420-440 ⓘ DolomiteFormula: Cu 2 FeSnS 4 Description: According to Moore and Howie (1984), stannite is a rare mineral at this locality, which was detected in only two of more than 100 samples studied. In both cases, it formed a narrow rim between kesterite and quartz.Silicates are by far the predominant group in terms of their abundance within the crust and mantle. (They will be discussed in Section 2.4). Some examples of minerals from the different mineral groups are given in Table 2.3. Gypsum (calcium sulphate CaSO 4 ·H 2 O), barite (barium sulphate BaSO 4) (Note that sulphates are different from sulphides. ⓘ Sphalerite. Formula: ZnS. Reference: Lasmanis, R. Geology of Spruce 16 claim, Rocks & Minerals, 1985 ⓘ 'Tetrahedrite Subgroup' Formula: Cu 6 (Cu 4 C 2+ 2)Sb 4 S ...

The composition of the sulfide minerals can be expressed with the general chemical formula A m S n, in which A is a metal, S is sulfur, and m and n are integers, giving A 2 S, ... The second distinct structural type is that of sphalerite (ZnS), in which each metal ion is surrounded by six oppositely charged ions arranged tetrahedrally. The third significant …The chemical formula (Zn, Fe) of sphalerite is S. It is a zinc sulphide containing a variable amount of iron instead of zinc in the mineral lattice. The iron content is normally less than 25% by weight.Banded sphalerite, near Hazel Green in Lafayette County, Wisconsin. Sample is about 1 cm long. Sphalerite occurs in a wide range of hydrothermal environments. It is common with chalcopyrite in exhalative massive sulfide bodies associated with volcanic rocks, such as those deposits near Rhinelander and Crandon. It is abundant in low temperature hydrothermal deposited widely known as Mississippi ... 3 pri 2018 ... ... Sphalerite almost always has some iron in it, so a better chemical formula would be (Zn,Fe)S. Sphalerite has a wide color range, depending ...Name (s) in local language (s): Grube Christine, Hasserode, Wernigerode, Harz, Sachsen-Anhalt, Deutschland. The Christine Mine did work in the early 19th century for lead and copper. The mine is located at the east side of the Sandtal valley near Darlinerode village, within spitting distance to the Brocken-granite-pluton.Kuripshyne. 127 (2020) 7.7km SSE. The Mighei (CM2) meteorite was observed to fall on 18 Jun 1889. After both sounds and light, a single stone of mass ~ 8 kg was recovered. Mighei is the prototype for the CM (Mighei-like) Carbonaceous Chondrites. There are 15 known CM falls and over 400 recorded finds. Most CM meteorites are petrologic type CM2.Sphalerite (sometimes spelled sphaelerite) is a sulfide mineral with the chemical formula ( Zn, Fe) S. [5] It is the most important ore of zinc. Sphalerite is found in a variety of deposit types, but it is primarily in sedimentary exhalative, Mississippi-Valley type, and volcanogenic massive sulfide deposits. Formula: K(Fe 2+ /Mg) 2 (Al/Fe 3+ /Mg/Ti)([Si/Al/Fe] 2 Si 2 O 10)(OH/F) 2 or Simplified: K(Mg,Fe) 3 AlSi 3 O 10 (OH) 2 Locality: Shedong W-Mo-polymetallic deposit, Cangwu Co., Wuzhou, Guangxi, China Reference: Zhiqiang Zhang, Maohong Chen, Jianming Mo, Liuyang Xiao, Zhizhong Huang, Jun Luo, and Chaohui Ou (2014): Acta Petrologica …Sphalerite and wurtzite are polymorphs. They share the same chemical formula (ZnS), but have different crystal habits. Sphalerite has an isometric crystal structure, while wurtzite has a hexagonal structure. These two minerals can coexist in alternating layers as schalenblende, a gem material used rarely for cabochons.

May 1, 2023 · Sphalerite is a mineral composed of zinc sulfide with the chemical formula ZnS. It’s known for its adamantine luster and can range in color from yellow to brownish-black, green, or red, depending on the amount of iron present. A common specimen of sphalerite contains dark crystals that shimmer when viewed under direct light.

Sphalerite (sometimes spelled sphaelerite) is a sulfide mineral with the chemical formula ( Zn, Fe) S. [5] It is the most important ore of zinc. Sphalerite is found in a variety of deposit types, but it is primarily in sedimentary exhalative, Mississippi-Valley type, and volcanogenic massive sulfide deposits. A group of quarries in gneiss located within Baltimore City near the junction of Stony Run and Jones Falls. The Harris Quarry is the most famous and is the type locality for haydenite and beaumontite. Provided many classic specimens cited in older mineralogy texts. Minerals listed are from the host gneiss, pockets within the gneiss and ...Jan 18, 2023 · The chemical formula of zinc sulphide is ZnS. Z n S. Zinc sulphide contains zinc (Zn2+) ( Z n 2 +) and sulphide (S2–) ( S 2 –) ions. The molar mass of zinc sulphide is 97.474g/mol. 97.474 g / m o l. Zinc sulphide appears in two crystalline forms such as sphalerite (zinc blende) and wurtzite. This phenomenon of existing in different forms is ... Significant examples include galena (lead sulfide), sphalerite (zinc sulfide), pyrite (iron sulfide, sometimes called “fool’s gold”), and chalcopyrite (iron-copper sulfide). Sulfides are well known for being important ore minerals. For example, galena is the main source of lead, sphalerite is the main source of zinc, ... The ᐧ2H 2 O in the formula indicates the water …Formula: KAl 2 (AlSi 3 O 10)(OH) 2 Reference: Shiqian Li, Xiaoming Lan, Songhua Deng, Shangfeng Chen, Fangyou Wang, Chuanbiao Li, and Guanghua Huang (2013): Mineral Deposits 32(2), 405-414 ⓘ Muscovite var: SericiteSphalerite is an ore—a mineral of economic value—that was once mined in southeastern Kansas for its zinc content. It is also called zinc blende, blende, blackjack, and mock lead. ... Chemical formula: ZnS (Zn = zinc, S = sulfur) Color: nearly colorless, but can be brown, yellow, black, or dark red due to impurities Streak: white to dark browntite < sphalerite < chalcopyrite < pyrite, but it is unknown if this sequence also applies to the seafloor environment. The common presence of sphalerite in seafloor gossans suggests that sphalerite, or at least Fe-poor varieties, may be resistant to oxidation. Some nonferrous sulfides, such as galena, are highly resistant to oxidative weathering.Element Zinc (Zn), Group 12, Atomic Number 30, d-block, Mass 65.38. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.mindat.orgSphalerite, which contains zinc sulfide, is the most abundant source. Zinc deficiency and toxicity have been reviewed [1, 2]. Zinc supplementation reduces the incidence of infection and increases the survival rate after infections in elderly people [3]. However, oral zinc sulfate has been overused in many fields of therapy, particularly in ...

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8 korr 2017 ... DFT calculation is a useful tool to study the crystal structure of minerals and the interaction, adsorption and reaction of flotation reagents ...The zinc leaching from sphalerite concentrate using oxygen under pressure in sulfuric acid solution was primarily studi…If you're starting to shop around for student loans, you may want a general picture of how much you're going to pay. If you're refinancing existing debt, you may want a tool to compare your options based on how far you've already come with ...Salafossa Mine (San Marco Mine; S. Marco Mine), San Pietro di Cadore, Belluno Province, Veneto, Italy : A lead-zinc mine owned by Pertusola Mining and Metallurgical. Sphalerite can be found in many ore veins of sulfide minerals, commonly associated with galena and pyrite. Miners call sphalerite "jack," "blackjack," or "zinc blende." Its impurities of gallium, indium and cadmium make sphalerite a major ore of those metals. Sphalerite has some interesting properties. It has excellent dodecahedral …The formula for a radius is the diameter of a circle divided by two. The radius of a circle is defined as the distance from the middle of a circle to any point on the edge of the circle.The formula for calculating eccentricity is e = c/a. In this formula, “e” refers to the eccentricity, “a” refers to the distance between the vertex and the center and “c” refers to the distance between the focus of the ellipse and the cente...Galena is a lead sulfide mineral with a chemical composition of PbS. It is the world's primary ore of lead and is mined from a large number of deposits in many countries. It is found in igneous and metamorphic rocks in medium- to low-temperature hydrothermal veins. In sedimentary rocks it occurs as veins, breccia cements, isolated grains, and ...The molecular or chemical formula of Zinc Sulfide is ZnS. It is obtained as a white or yellowish-white crystal. The sphalerite occurs as a greyish white crystal. ZnS is insoluble in water as well as denser than water. Naturally, it occurs as the mineral zinc blende which is also known as sphalerite. It is a mixture of zinc sulfide and iron. ….

The sphalerite chemical formula is ZnS (zinc sulfide.) This chemical formula represents sphalerite in its pure form, but it is much more commonly found with significant amount of other elements substituting zinc. Up to 26 % Fe, 17 % Cd, 15 % Hg, 21 % Mn and small amounts of Cu, In, Ga, Ge and As may replace the zinc.Its main ore mineral is sphalerite, which is a zinc sulfide mineral with the chemical formula ZnS. Sphalerite is found in a variety of mineral deposit types ...Brassy, tabular crystals of pyrrhotite, with sphalerite and quartz, from Nikolaevskiy Mine, Primorskiy Kray, Russia. Specimen size: 5.3 x 4.1 x 3.8 cm. Pyrrhotite ( pyrrhos in Greek meaning "flame-coloured") is an iron sulfide mineral with the formula Fe (1-x) S (x = 0 to 0.125). It is a nonstoichiometric variant of FeS, the mineral known as ...Picher Field, Cherokee County, Kansas, USA : See also OklahomaAnti-Atlas Mountains Mountain Range. Bou Azzer mining district Mining District. Bouismas Mine, Tansifite Caïdat, Agdz Cercle, Zagora Province, Drâa-Tafilalet Region, Morocco : A silver-rich vein was mined from mid-2008 to spring 2010. It produced partial pseudomorphs of allargentum (+ minor silver) after dyscrasite. 31 mar 2023 ... ... sphalerite, a mineral with the chemical formula Zns. One method of processing zinc metal from its ore involves first reacting the sphalerite ...The American Fluorite Museum is now located on the mill site, which was also the location of the Rosiclare shaft. A small dump of the mill lies just outside the fence of the museum property and contains: calcite, chalcopyrite, fluorite, galena, malachite, quartz and sphalerite. The molecular or chemical formula of Zinc Sulfide is ZnS. It is obtained as a white or yellowish-white crystal. The sphalerite occurs as a greyish white crystal. ZnS is insoluble in water as well as denser than water. Naturally, it occurs as the mineral zinc blende which is also known as sphalerite. It is a mixture of zinc sulfide and iron. Salafossa Mine (San Marco Mine; S. Marco Mine), San Pietro di Cadore, Belluno Province, Veneto, Italy : A lead-zinc mine owned by Pertusola Mining and Metallurgical. Sphalerite formula, Jul 22, 2011 · Various models have been proposed to explain the formation mechanism of colloform sphalerite, but the origin is still under debate. In order to decipher influences on trace element incorporation and sulfur isotope composition, crystalline and colloform sphalerite from the carbonate-hosted Mississippi-Valley Type (MVT) deposit near Wiesloch, SW Germany, were investigated and compared to ... , Explanation - Sphalerite: . ZnS is the chemical formula for sphalerite, a zinc sulfide mineral.; It can be found in metamorphic, igneous, and sedimentary rocks.; Sphalerite is the most prevalent zinc mineral and the most important zinc resource on the planet.; It's a zinc sulfide with varying levels of iron that acts as a zinc replacement in the …, Cleavage: Sphalerite has a perfect dodecahedral cleavage parallel to {011}. Its fracture is conchoidal. Crystallography: Isometric, Tetrahedral The tetrahedron, ..., View of active end of quarry, September 2008 Lincoln Quarry, Clinton Township, Niagara Region, Ontario, Canada. In Dolomitic Limestone (Lockport formation dolostones). Owned by Genstar Ltd. Located about 3 miles (5.1 km) SW of Beamsville and about 15½ miles West of St Catherines. 13 valid minerals., , ZnS occurs in two common polytypes, zincblende (also called sphalerite) and wurtzite. The two types have these features in common: a 1:1 stoichiometry of Zn:S. a coordination of 4 for each ion …, ZnS – Zinc Blende, Sphalerite: Interactive 3D Structure. CONTROLS. Coordination – 4:4 (tetrahedral) ccp S 2- with Zn 2+ in half Td holes. Polyhedra – vertex-sharing ZnS 4 and SZn 4. tetrahedra. Half of the tetrahedral holes in a cubic close packing are occupied. Related Structure: Wurtzite (ZnS) 284., ⓘ Sphalerite ⓘ Tellurobismuthite ... Formula: AD 3 G 6 (T 6 O 18)(BO 3) 3 X 3 Z. Reference: Ferenc Š, Bakoš F.,2006: Au-Bi-Te mineralizácia v sineckej astrižnej zóne (Kokava nad Rimavicou) – nový typ mineralizácie v …, ... formula A rough colinearity with sphalerite and covellite is apparently maintained. The optical properties of this mineral are, by analogy with the Cu-Fe-S ..., Galena is a lead sulfide mineral with a chemical composition of PbS. It is the world's primary ore of lead and is mined from a large number of deposits in many countries. It is found in igneous and metamorphic rocks in medium- to low-temperature hydrothermal veins. In sedimentary rocks it occurs as veins, breccia cements, isolated grains, and ..., 12 mar 2022 ... Sphalerite symbolizes bravery, vigor, and spark. In terms of elements, sphalerite is both a fire and earth stone. As a fire and earth stone, ..., Chalcopyrite is most often found with pyrite and other sulfide minerals, as well as sphalerite, galena, dolomite, tourmaline or quartz. It can oxidize to form a number of minerals such as malachite, azurite, and cuprite. In Our Society: The Economic Importance of Chalcopyrite. Throughout human history, chalcopyrite has been our leading source of copper. This is …, Zinc sulfide (ZnS) is a unique compound that forms two types of crystalline structures. These two polymorphs are wurtzite and zincblende (also known as sphalerite). Wurtzite has a hexagonal structure, while zincblende is cubic. It is characterized by single bonds between each atom and maintenance of a 1:1 zinc to sulfur ratio. , A s = 4πr 2: Start with the formula for the surface area of a sphere in terms of its radius r . ( 4πr 2 ) 3 : Cube it by taking it to the power of 3. 4 3 π 3 r 6: Distribute the exponent 3 throughout the formula. 4π( 4 2 π 2 r 6): Factor out the 4π by placing it outside using parentheses. 4π x 3 2 ( 4 2 π 2 r 6 / 3 2) : Factor out 3 2. 36 π ( 4π r 3 /3 ) 2: …, Name (s) in local language (s): Grube Christine, Hasserode, Wernigerode, Harz, Sachsen-Anhalt, Deutschland. The Christine Mine did work in the early 19th century for lead and copper. The mine is located at the east side of the Sandtal valley near Darlinerode village, within spitting distance to the Brocken-granite-pluton., Sphalerite, which contains zinc sulfide, is the most abundant source. Zinc deficiency and toxicity have been reviewed [1, 2]. Zinc supplementation reduces the incidence of infection and increases the survival rate after infections in elderly people [3]. However, oral zinc sulfate has been overused in many fields of therapy, particularly in ..., Various models have been proposed to explain the formation mechanism of colloform sphalerite, but the origin is still under debate. In order to decipher influences on trace element incorporation and sulfur isotope composition, crystalline and colloform sphalerite from the carbonate-hosted Mississippi-Valley Type (MVT) deposit near …, ⓘ Sphalerite. Formula: ZnS. Reference: Dean Rossell and Steven Coombes ,April 29, 2005, THE GEOLOGY OF THE EAGLE NICKEL-COPPER DEPOSIT MICHIGAN, USA ; Kennecott Minerals Co. ⓘ Violarite. Formula: Fe 2+ Ni 3+ 2 S 4. Reference: Dean Rossell and Steven Coombes ,April 29, 2005, THE GEOLOGY OF THE EAGLE NICKEL …, The most mined zinc ore for commercial uses is sphalerite (zinc sulfide), which contains 67.0% zinc. The most common zinc compound used in industry is zinc oxide. The world mine production of zinc metal was about 13 million tons in 2019 being the fourth of all metal production after iron, aluminum, and copper. , Reference: UGMS Bull 117 Minerals and Mineral Localities of Utah; Calkins, F. C.; Butler, B. S.; Heikes, V. C. (1943) Geology and ore deposits of the Cottonwood-American Fork area, Utah, with sections on history and production. USGS Professional Paper: 201 ⓘ Malachite, View of active end of quarry, September 2008 Lincoln Quarry, Clinton Township, Niagara Region, Ontario, Canada. In Dolomitic Limestone (Lockport formation dolostones). Owned by Genstar Ltd. Located about 3 miles (5.1 km) SW of Beamsville and about 15½ miles West of St Catherines. 13 valid minerals., ZnS – Zinc Blende, Sphalerite: Interactive 3D Structure. CONTROLS. Coordination – 4:4 (tetrahedral) ccp S 2- with Zn 2+ in half Td holes. Polyhedra – vertex-sharing ZnS 4 and SZn 4. tetrahedra. Half of the tetrahedral holes in a cubic close packing are occupied. Related Structure: Wurtzite (ZnS) 284., Sphalerite, also known as blende or zinc blende, is the major ore of zinc. When pure (with little or no iron) it forms clear to white crystals (known as Cleiophane ). Yellow to orange sphalerite is often called "golden sphalerite." Red shades of sphalerite are known as Ruby Blende or Ruby Jack. As iron content increases, sphalerite forms dark ... , mindat.org, Formula: (Ba 0.5,Ca 0.5,K,Na) 5 [Al 5 Si 11 O 32] · 12H 2 O Locality: Obereisenhausen Diabase quarry, Steffenberg, Marburg-Biedenkopf, Giessen Region, Hesse, Germany Reference: Uwe Kolitsch collection (PXRD and/or SEM-EDS analyses), Formula Units/Cell (Z), 4, 4. Molecular Weight, 97.46 g/mol, 97.46 g/mol. Mechanical Properties, Metric, English, Comments. Knoop Microhardness, 1780, 1780, N/ ..., The chemical formula of sphalerite is (Zn,Fe)S. It is a zinc sulfide containing variable amounts of iron that substitutes for zinc in the mineral lattice. The iron content is normally less than 25% by weight., Classes of Minerals. Minerals are classified according to their chemical properties. Except for the native element class, the chemical basis for classifying minerals is the anion, the negatively charged ion that usually shows up at the end of the chemical formula of the mineral. For example, the sulfides are based on the sufur ion, S 2–., CAMEO Chemicals. Sphalerite is a mineral with formula of Zn 2+ S 2- or ZnS. The IMA symbol is Sp. RRUFF Project. Zinc sulfide is a sulfide of zinc. It occurs naturally as the mineral sphalerite. Zinc sulfide is a semiconductor and is used as an infrared optical material and as phosphor in applications such as cathode ray tubes and glow in the ... , Includes Ghezuri and Turț Bai deposits/structures. The mine is near the Turț village which is located 45 km NW of Baia Mare and about 20 km NE of Satu Mare, Oasului Mts. Note: most wurtzites from here are actually paramorphs of sphalerite after wurtzite (Clain & Haake, 2006). 29 valid minerals. , Mlýnské Struhadlo, Bezděkov , Distrito de Klatovy, Región de Pilsen, República Checa. Sedimentary metamorphosed U-sulphidic mineralization. Located in the area of the village of Struhadlo. Not to be confused with the municipality Mlýnské Struhadlo. Note: Some goldmanite specimens are labeled as being from the village of Tetětice ( https ..., Smolyan Province. Madan ore field Ore Field. Europe. Mountain Range. Krushev dol Mine, Madan Municipality, Smolyan Province, Bulgaria : Pb-Zn deposit. Famous for excellent specimens of galena, sphalerite, chalcopyrite and others. 'Krushev Dol' means 'Valley of the pears'. , The sphalerite chemical formula is ZnS (zinc sulfide.) This chemical formula represents sphalerite in its pure form, but it is much more commonly found with significant amount of other elements substituting zinc. Up to 26 % Fe, 17 % Cd, 15 % Hg, 21 % Mn and small amounts of Cu, In, Ga, Ge and As may replace the zinc.