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The scientific study of the origin, history, and physical features of the earth.

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Geology > Minerals

Mexican diamond

Geology; Minerals

Mexican diamond is a misleading term for rock crystal, and not a diamond at all.

mahogany obsidian

Geology; Minerals

Mahogany Obsidian (also called Apache tears) is brownish obsidian. This glassy, lustrous mineral is found in lava flows, and obsidian stones can be massive. Obsidian is formed ...


Geology; Minerals

Metatorbernite (or meta-torbernite) is a radioactive phosphate mineral, and is a dehydration pseudomorph of torbernite. Chemically, it is a copper uranyl phosphate and usually ...


Geology; Minerals

Andersonite, Andersonit or Andersonita (Na 2 CaUO 2 (CO 3 ) 3 •6H 2 O), or hydrated sodium calcium uranyl carbonate is a rare uranium carbonate mineral that was only described in ...


Geology; Minerals

Metazeunerite is an arsenate mineral with a chemical formula of Cu(UO 2 ) 2 (AsO 4 ) 2 ·8H 2 O. The origin of this mineral comes from the dehydration process that metazeunerite ...

sal ammoniac

Geology; Minerals

Sal ammoniac is a rare mineral composed of ammonium chloride, NH 4 Cl. It forms colorless to white to yellow-brown crystals in the isometric-hexoctahedral class. It has very poor ...


Geology; Minerals

Muscovite (also known as common mica, isinglass, or potash mica ) is a phyllosilicate mineral of aluminium and potassium with formula KAl 2 (AlSi 3 O 10 )(F,OH) 2 , or (KF) 2 (Al ...