Geographic Minerals

Coconinoite [Formula: Fe3+2 Al2(UO2)2(PO4)4(SO4)(OH)2•20(H2O)] is a uranium ore that was discovered in Coconino County, Arizona. It is a monoclinic mineral containing aluminum, hydrogen, iron, oxygen,…

Coccinite is a rare mercury iodide mineral with the chemical formula of HgI2, mercury(II) iodide. It is a native mercury iodide found especially at Broken…

Cobaltite is a sulfide mineral composed of cobalt, arsenic, and sulfur, CoAsS. It is a sulfosalt mineral, containing sulfur, arsenic, and cobalt. The mineral was…

Clintonite is a calcium magnesium aluminum phyllosilicate mineral. It is a group of micas that contain calcium instead of potassium. It occurs in chlorite schists,…

Clinozoisite is a complex calcium aluminum sorosilicate mineral with formula: Ca2Al3(Si2O7)(SiO4)O(OH). It is colorless, yellow, greenish, or pale rose-red mineral similar to Epidote, but containing…

Clinoptilolite is a natural zeolite comprising a microporous arrangement of silica and alumina tetrahedra. It has the complex formula: (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12H2O. The name is derived from…

Clinohumite is an uncommon member of the humite group, a magnesium silicate according to the chemical formula (Mg, Fe)9(SiO4)4(F, OH)2. It was first discovered in…

Clinohedrite is a rare silicate mineral. Its chemical composition is a hydrous calcium-zinc silicate; CaZn(SiO4)·H2O. Under shortwave ultraviolet light it fluoresces a rich orange color.…

Clinoclase is a hydrous copper arsenate mineral, Cu3AsO4(OH)3. It is a rare secondary copper mineral. It was first known from the Wheal Gorland Mine (now…

Cleusonite is a member of the crichtonite group of minerals with a chemical formula of (Pb, Sr)(U4+, U6+)(Fe2+, Zn)(Ti, Fe2+, Fe3+)18(O, OH)38. It was found…

Clearcreekite is polymorphous with peterbaylissite. The chemical formula of clearcreekite is Hg1+3CO3(OH)∙2H2O. It is a monoclinic-prismatic pale greenish yellow mineral containing carbon, hydrogen, mercury, and…

Clausthalite is a lead selenide mineral, PbSe. It forms a solid solution series with galena PbS. is a member of the Galena Group of minerals.…