Geographic Minerals

Glaucodot is a cobalt iron arsenic sulfide mineral with formula: (Co, Fe)AsS. The cobalt: iron(II) ratio is typically 3:1 with minor nickel substituting. It is…

Glaucochroite is a calcium manganese nesosilicate mineral with formula: CaMnSiO4. It occurs in metamorphosed limestones. It is a mineral that consists of a calcium manganese…

Glauberite is a monoclinic sodium calcium sulfate mineral with the formula Na2Ca(SO4)2. It is named for the salt that helps compose its chemistry called “Glauber’s…

Gismondine is a mineral with the chemical formula CaAl2Si2O8·4(H2O). It is a zeolite or hydrated alumino-silicate. It is a native hydrated silicate of alumina, lime,…

Gilalite is a copper silicate mineral with a chemical composition of Cu2Si6O17·7(H2O). It is a monoclinic mineral containing copper, hydrogen, oxygen, and silicon. It was…

Gibbsite, Al(OH), is one of the mineral forms of aluminum hydroxide. It is a colorless mineral consisting of hydrated aluminum hydroxide, occurring chiefly as a…

Getchellite is a rare sulfide of arsenic and antimony, AsSbS3. It is a monoclinic-prismatic mineral containing antimony, arsenic, and sulfur. It was discovered by B.…

Gersdorffite is a nickel arsenic sulfide mineral with formula NiAsS. It is a mineral consisting of nickel sulphid and nickel arsenide, having a silver-white to…

Germanite is a rare copper iron germanium sulfide mineral, Cu26Fe4Ge4S32. It was first discovered in 1922, and named for its germanium content. It is a…

Georgerobinsonite, named for George Willard Robinson, is a lead chromate mineral with formula Pb4(CrO4)2(OH)2FCl. The type specimen for georgerobinsonite was found in the Mammoth-St. Anthony…

Geocronite is a mineral, a mixed sulfosalt containing lead, antimony, and arsenic with a formula of Pb14(Sb, As)6S23. It is a mineral consisting of a…

Geikielite is a magnesium titanium oxide mineral with formula: MgTiO3. It is a member of the ilmenite group. It is a mineral consisting of magnesium…