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Minerals
Naturally occurring substance that is solid and stable at room temperature, representable by a chemical formula, usually abiogenic, and has an ordered atomic structure. It is different from a rock, which can be an aggregate of minerals or non-minerals, and does not have a specific chemical composition. The general definition of a mineral encompasses the following criteria: 1 - Naturally occurring 2 - Stable at room temperature 3 - Represented by a chemical formula 4 - Usually abiogenic 5 - Ordered atomic arrangement
Contributors in Minerals
Minerals
hedenbergite
Geology; Minerals
Hedenbergite, CaFeSi 2 O 6 , is the iron rich end member of the pyroxene group having a monoclinic crystal system. The mineral is extremely rarely found as a pure substance, and usually has to be ...
macaulayite
Geology; Minerals
Macaulayite is a red, earthy, monoclinic mineral, with the chemical formula (Fe 3+ , Al) 24 Si 4 O 43 (OH) 2 . It was discovered in the 1970s by Dr Jeff Wilson and named after the Macaulay Institute ...
skutterudite
Geology; Minerals
Skutterudite is a cobalt arsenide mineral that has variable amounts of nickel and iron substituting for cobalt with a general formula: (Co,Ni,Fe)As 3 . Some references give the arsenic a variable ...
akaganéite
Geology; Minerals
Akaganéite is an iron(III) oxide-hydroxide / chloride mineral with formula: Fe 3+ O(OH,Cl) e.g.; β-FeO(OH). It is formed by the weathering of pyrrhotite (Fe 1-x S). Nickel also has been reported in ...
