Geographic Minerals

Astrophyllite: Properties and Occurrence

Astrophyllite: Properties and Occurrence

Astrophyllite [Formula: (K, Na)3(Fe++, Mn)7Ti2Si8O24(O, OH)7] is a very rare, brown to golden-yellow hydrous potassium iron titanium silicate mineral. It is a unique and rare formation of titanium silicate. Its name comes from a Greek word meaning “star leaf” because that is what the formatio.....

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Asisite: Properties and Occurrence

Asisite: Properties and Occurrence

Asisite (Formula- Pb7SiO8Cl2) is a yellow tetragonal mineral. It is a very rare lead oxyhalide found only at the Kombat mine. Asisite was named after the Asis farm located at the Kombat mine, Namibia. It is found at Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia. It was .....

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Ashoverite

Ashoverite

Ashoverite is one of three polymorphs of zinc hydroxide, Zn(OH)2. It is a rare mineral first found in a limestone quarry near Ashover, Derbyshire, England, in 1988. It has also been found in the Harz mountain range in Germany, and in Namibia. The mineral was discovered after samples of the polymo.....

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Ashburtonite

Ashburtonite

Ashburtonite is a rare lead copper silicate-bicarbonate mineral with formula: HPb4Cu2+4Si4O12 (HCO3)4(OH)4Cl. It contains tetragonal-dipyramidal blue mineral containing carbon, chlorine, copper, hydrogen, lead, oxygen, and silicon. It is not radioactive. It occurs at the type locality at a weathe.....

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Artroeite: Properties and Occurrence

Artroeite: Properties and Occurrence

Artroeite, formula – [PbAlF3(OH)2] is a mineral found in Arizona. It is named for the late American chemist Arthur Roe (1912–1993). The structure was solved by direct methods and refined to R = 0.022 using X-ray diffractometer data (1096 independent reflections). In the structure, edge-s.....

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Artinite

Artinite

Artinite is a hydrated magnesium carbonate mineral with formula: Mg2(CO3)(OH)2·3H2O. It is a somewhat rare carbonate mineral. It forms as a crust of acicular to fibrous crystal aggregates sometimes collected into tight perfectly spherical balls. In fact, a specimen of artinite without serpentine.....

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Arthurite: Properties and Occurrence

Arthurite: Properties and Occurrence

Arthurite is a mineral composed of divalent copper and iron ions in combination with trivalent arsenate, phosphate and sulfate ions with hydrogen and oxygen. It is a rare copper iron arsenate. Localities include in England, Germany, Portugal, Spain, Chile, the United States, and Australia among a.....

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Arsenopyrite: Properties and Occurrence

Arsenopyrite: Properties and Occurrence

Arsenopyrite is an iron arsenic sulfide (FeAsS). It is the most prevalent mineral containing the element arsenic. It is an iron arsenic sulfide mineral which is the most common arsenic-bearing mineral found worldwide. The mineral was named for the presence of arsenic in its composition. Arsenopyr.....

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Arsenolite: Properties and Occurrence

Arsenolite: Properties and Occurrence

Arsenolite is an arsenic mineral, chemical formula As4O6. It is formed as an oxidation product of arsenic sulfides. It is an uncommon mineral that occurs as a product of the oxidization of arsenic-bearing sulfides in hydrothermal veins and can be formed during mine fires and in burning coal seams.....

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Arsenoclasite

Arsenoclasite

Arsenoclasite (originally arsenoklasite) is a red or dark orange-brown mineral with formula Mn5(AsO4)2(OH)4. It is a mineral consisting of a basic manganese arsenate. It is containing arsenic, hydrogen, manganese, and oxygen. It is not radioactive. The mineral was discovered in 1931 in Långban, .....

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Arseniosiderite: Properties and Occurrence

Arseniosiderite: Properties and Occurrence

Arseniosiderite (formula- Ca2Fe3+3(AsO4)3O2·3H2O) is a rare arsenate mineral formed by the oxidation of other arsenic-containing minerals, such as scorodite or arsenopyrite. It is a rare secondary mineral formed by the oxidation of earlier arsenic-bearing minerals, typically scorodite or arsenop.....

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Arsenic: Properties and Occurrence

Arsenic: Properties and Occurrence

Arsenic is a chemical element with symbol ‘As’ and atomic number 33. The element takes its name from the Latin word “arsenicum” or the Greek word “arrenikos” meaning masculine, alluding to the mineral’s potent properties. It occurs in many minerals, usually in combination with sulfu.....

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