Geographic Minerals

Drysdallite is a rare molybdenum selenium sulfide mineral with formula Mo(Se, S)2. It is a rare, opaque molybdenum selenium sulfide mineral. It crystallizes in the…

Donnayite-(Y) is a rare-earth carbonate mineral containing the rare-earth metal yttrium. It was first discovered in 1978 at Mont St-Hilaire, Quebec. It can be found…

Domeykite is a copper arsenide mineral, Cu3As. It is a semi-metal alloy of copper and arsenic. It crystallizes in the isometric system, although crystals are…

Dolomite is an anhydrous carbonate mineral composed of calcium magnesium carbonate, ideally CaMg(CO3)2. It is a common rock-forming mineral. It is rarely found in modern…

Dollaseite-(Ce) is an epidote found in metamorphosed limes times and is very rare. It is a sorosilicate end-member epidote mineral and was discovered by Gajer…

Dmitryivanovite is a natural mineral composed of calcium, aluminum, and oxygen, with the molecular formula CaAl2O4. It was reported in 2009 in a calcium-aluminum-rich inclusion…

Djurleite is a copper sulfide mineral of secondary origin with formula Cu31S16 that crystallizes with monoclinic-prismatic symmetry. It is typically massive in form but does…

Djerfisherite is an alkali copper–iron sulfide mineral and a member of the djerfisherite group. It is an isometric-hexoctahedral mineral containing chlorine, copper, iron, nickel, potassium,…

Dioptase is an intense emerald-green to bluish-green copper cyclosilicate mineral. It is transparent to translucent. Its formula is CuSiO3·H2O [also reported as CuSiO(OH)2]. It is…

Diopside is the mineral derives its name from the Greek words dis and opse, which mean twice and face, in reference to the two ways…

Dimorphite, chemical name tetraarsenic trisulfide (As4S3), is a very rare orange-yellow arsenic sulfide mineral. It is an orthorhombic-dipyramidal orange mineral containing arsenic and sulfur. In…

Digenite is a copper sulfide mineral with formula: Cu9S5. It is an important ore of copper, although it is not very well known even by…