12 Terms
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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
maucherite
Geology; Minerals
Maucherite is a grey to reddish silver white nickel arsenide mineral. It crystallizes in the tetragonal crystal system. It occurs in hydrothermal veins alongside other nickel arsenide and sulfide ...
alloclasite
Geology; Minerals
Alloclasite ((Co,Fe)AsS) is a sulfosalt mineral. It is a member of the arsenopyrite group. Alloclasite crystallizes in the monoclinic system and typically forms as columnar to radiating acicular ...
francolite
Geology; Minerals
Francolite is a carbonate rich variety of the mineral Fluorapatite and is present in most sedimentary phosphorites. It has a variable chemical composition which can be represented by (Ca, Mg, Sr, Na) ...
mascagnite
Geology; Minerals
Mascagnite is a rare ammonium sulfate mineral (NH 4 ) 2 SO 4 . It crystallizes in the orthorhombic system typically forming as stalactitic masses exhibiting good cleavage. It is soft (not higher than ...
tschermigite
Geology; Minerals
Tschermigite is a mineral form of ammonium alum, formula NH 4 AlSO 4 ·12(H 2 O). It is found in burning coal seams, bituminous shale and fumaroles. Because of its extreme water solubility it is ...
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