Geographic Minerals

Tetrahedrite

Tetrahedrite

Tetrahedrite is composed of two-component minerals: tetrahedrite, the end member rich in antimony, and tennantite, the end member rich in arsenic. It is a mineral of copper antimony sulfosalt with the formula: (Cu, Fe)12Sb4S13, that is an essential copper and sometimes silver ore. It occurs in me.....

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Enargite

Enargite

Enargite, mineral sulfosalt, copper arsenic sulfide (Cu3AsS4), which is sometimes a significant copper ore. Enargite is named in reference to its distinctive flawless cleavage, for the Greek term enargos, meaning “distinct”. To violet-black mineral with a metallic luster, it is a steel stone,.....

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Mesolite: Properties and Occurrences

Mesolite: Properties and Occurrences

Mesolite is a mineral of the zeolite family, similar to natrolite. It is a fragile member of the zeolite group and forms almost exclusively in delicate, needle-like crystal habits. It is a tectosilicate mineral with formula Na2Ca2(Al2Si3O10)3·8H2O. It is a sodium calcium zeolite, is intermedi.....

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Merrillite: Properties and Occurrences

Merrillite: Properties and Occurrences

Merrillite is a calcium phosphate mineral with the chemical formula Ca9NaMg(PO4)7. It is a calcium phosphate mineral found in some meteorites. It is an anhydrous, sodic member of the whitlockite group. It is the anhydrous end-member of the merrillite–whitlockite solid solution series, with whit.....

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Cassiterite – a Tin Oxide Mineral

Cassiterite – a Tin Oxide Mineral

Cassiterite is a reddish, brownish, or yellowish mineral consisting of tin dioxide. It is the most important source of tin, and most of the world’s supply of tin is obtained by mining cassiterite. It is a tin oxide mineral, SnO2. It is generally opaque, but it is translucent in thin crystals. I.....

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Meridianiite: Properties and Occurrences

Meridianiite: Properties and Occurrences

Meridianiite is the mineral consisting of magnesium sulfate undecahydrate, MgSO4•11H2O. These minerals can form by precipitation from a saturated solution or through evaporation of a brine solution at or below the surface. It is colorless transparent crystalline salt that precipitates fro.....

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Merenskyite: Properties and Occurrences

Merenskyite: Properties and Occurrences

Merenskyite is a rare telluride / bismuthinide mineral with formula: (Pd, Pt)(Te, Bi)2. It is a trigonal-ditrigonal pyramidal white mineral containing bismuth, palladium, platinum, and tellurium. Tellurides with Ag and /or Au are widespread in meso and epithermal environments; they are structural.....

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Mereheadite: Properties and Occurrences

Mereheadite: Properties and Occurrences

Mereheadite is a monoclinic-prismatic mineral containing chlorine, hydrogen, lead, and oxygen. It is a rare oxychloride that can be found with Mendipite at Merehead Quarry, Cranmore, Somerset, in the United Kingdom. It is a new mineral related to litharge and which is structurally similar to synt.....

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Meneghinite: Properties and Occurrences

Meneghinite: Properties and Occurrences

Meneghinite is a rare mineral that generally forms interesting acicular crystals. It is a sulfosalt mineral with the chemical formula CuPb13 Sb7S24. It is a mineral consisting of dark lead-gray lead antimony sulfide. It is a monoclinic sulphide and antimonide of lead and copper, CuPb₁₃ Sb.....

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Mendozite: Properties and Occurrences

Mendozite: Properties and Occurrences

Mendozite is a sulfate mineral, one of the alum series, with formula NaAl (SO4)2·11H2O. It is a mineral consisting of a monoclinic hydrous sulfate of sodium and aluminum. It is a hydrated form of sodium aluminum sulfate (soda alum). It is a sulfate mineral of the alum series; a hydrated form of .....

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Mendipite: Properties and Occurrences

Mendipite: Properties and Occurrences

Mendipite is an orthorhombic-disphenoidal mineral containing chlorine, lead, and oxygen. It is a rare mineral that was named in 1939 for the locality where it is found, the Mendip Hills in Somerset, England. It is an oxyhalide of lead with formula Pb3Cl2O2. This mineral is rare and occurs a.....

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Melonite: Properties and Occurrences

Melonite: Properties and Occurrences

Melonite is a nickel telluride mineral. It is a telluride of nickel; it is a metallic mineral. A nickel telluride which occurs in reddish-white granular forms with metallic luster: found in California and also in Colorado. Its chemical formula is NiTe2. It is opaque and white to reddish-white in .....

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