10 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
staurolite
Geology; Minerals
Staurolite is a red brown to black, mostly opaque, nesosilicate mineral with a white streak. It crystallizes in the monoclinic crystal system, has a Mohs hardness of 7 to 7.5 and a rather complex ...
povondraite
Geology; Minerals
Povondraite is a rare silicate mineral from the tourmaline group with formula: NaFe 3+ 3 (Fe 3+ 4 ,Mg 2 )(BO 3 ) 3 Si 6 O 18 (OH) 3 O. It is a dark brown to black nearly opaque mineral with a ...
