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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
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Minerals
ulvöspinel
Geology; Minerals
Ulvöspinel or ulvite is an iron titanium oxide mineral with formula: Fe 2 TiO 4 or TiFe 2+ 2 O 4 . It forms brown to black metallic isometric crystals with a Mohs hardness of 5.5 to 6. It belongs ...
athabascaite
Geology; Minerals
Athabascaite is a member of the copper selenide minerals, and forms with other copper selenides. It was first discovered by S. Kaiman in 1949 while he was researching radioactive materials around ...
niedermayrite
Geology; Minerals
Niedermayrite is a rare hydrated copper cadmium sulfate hydroxide mineral with formula: Cu 4 Cd(SO 4 ) 2 (OH) 6 ·4H 2 O. It crystallizes in the monoclinic system and occurs as encrustations and well ...
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