Geographic Minerals

Knorringite: Properties and Occurrences

Knorringite: Properties and Occurrences

Knorringite is a mineral species belonging to the garnet group and forms a series with the species pyrope. It is a green or blue mineral of the garnet group, forming a series with pyrope. Synthetic knorringite has the pure endmember formula Mg3Cr2(SiO4)3. It was discovered in 1968 in the Kao kimb.....

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Knebelite – Physical Properties

Knebelite – Physical Properties

Knebelite is a manganese variety of the fayalite-tephroite series with formula (Fe, Mn)2SiO4. It forms dark green orthorhombic crystals. It is a variety of Fayalite-Tephroite Series. It is a silicate mineral, a manganese variety of fayalite that forms dark green orthorhombic crystals. It is repor.....

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Kleinite: Properties and Occurrences

Kleinite: Properties and Occurrences

Kleinite is a rare mineral that has only been found in the United States and Germany that occurs in hydrothermal mercury deposits. It is a mineral consisting of a basic oxide, sulfate, and chloride of mercury and ammonium. Kleinite is named after Carl Klein (1842–1907), who was a professor of m.....

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Kinoite: Properties and Occurrences

Kinoite: Properties and Occurrences

Kinoite [Ca2Cu2Si3O8(OH)4] or [Ca2Cu2Si3O10·2H3O] is a light blue copper silicate mineral. It is somewhat scarce. It is a monoclinic-prismatic azure blue mineral containing calcium, copper, hydrogen, oxygen, and silicon. It is an attractive copper mineral. Its general light blue color is signifi.....

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Kieserite: Properties and Occurrences

Kieserite: Properties and Occurrences

Kieserite is the magnesium sulfate mineral (MgSO4·H2O) and is named after Dietrich Georg von Kieser (Jena, Germany 1862). It is a fine-grained white mineral consisting of hydrated magnesium sulfate, occurring often in salt mines. It is an effective source of both magnesium and sulfur. General In.....

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Khatyrkite: Properties and Occurrences

Khatyrkite: Properties and Occurrences

Khatyrkite is a rare mineral which is mostly composed of copper and aluminum but may contain up to about 15% of zinc or iron. Its chemical structure is described by an approximate formula (Cu, Zn)Al2 or (Cu, Fe)Al2. It is a copper-aluminum mineral, closely related to cupalite. It was discovered i.....

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Keyite: Properties and Occurrences

Keyite: Properties and Occurrences

Keyite is a mineral with the chemical formula Cu32+Zn4Cd2(AsO4)6·2H2O. It is a monoclinic-prismatic azure mineral containing arsenic, cadmium, calcium, copper, hydrogen, manganese, oxygen, and zinc. The name comes from Charles Locke Key (born 1935), an American mineral dealer who furnished its f.....

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Kesterite: Properties and Occurrences

Kesterite: Properties and Occurrences

Kesterite is a sulfide mineral with a formula Cu2(Zn, Fe)SnS4. In its lattice structure, zinc and iron atoms share the same lattice sites. It is the Zn-rich variety whereas the Zn-poor form is called ferrokesterite or stannite. Owing to their similarity, kesterite is sometimes called isostannite......

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Kernite: Properties and Occurrences

Kernite: Properties and Occurrences

Kernite, also known as rasorite is a hydrated sodium borate hydroxide mineral with formula Na2B4O6(OH)2·3H2O. It is a colorless to white mineral crystallizing in the monoclinic crystal system typically occurring as prismatic to acicular crystals or granular masses. Kernite could be considered a .....

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Kermesite: Properties and Occurrences

Kermesite: Properties and Occurrences

Kermesite or antimony oxysulfide is also known as red antimony (Sb2S2O). It is an unusual sulfide mineral. The mineral’s color ranges from cherry red to a dark red to a black. It is the result of partial oxidation between stibnite (Sb2S3) and other antimony oxides such as valentinite (Sb2O3] or.....

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Keilite: Properties and Occurrences

Keilite: Properties and Occurrences

Keilite is an iron-magnesium sulfide mineral [chemical formula- (Fe, Mg)S)] that is found in enstatite chondrites. It is an isometric-hexoctahedral gray mineral containing calcium, chromium, iron, magnesium, manganese, sulfur, and zinc It is the iron-dominant analog of niningerite. It is named af.....

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Kegelite: Properties and Occurrences

Kegelite: Properties and Occurrences

Kegelite is a complex silicate mineral with formula Pb8Al4Si8O20(SO4)2(CO3)4(OH)8. It is a monoclinic mineral containing aluminum, carbon, hydrogen, lead, oxygen, silicon, and sulfur. It was first described in 1975 for an occurrence in the Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia and named f.....

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