Geographic Minerals

Gmelinite-Na is one of the rarer zeolites but the most common member of the gmelinite series, gmelinite-Ca, gmelinite-K and Gmelinite-Na. It is closely related to…

Godovikovite is a rare sulfate mineral with the chemical formula: (NH4)Al(SO4)2. Aluminum can partially be substituted by iron. Hydration of godovikovite gives the ammonium alum,…

Glaucophane is the name of a mineral and a mineral group belonging to the sodic amphibole supergroup of the double chain inosilicates. Glaucophane is named…

Glauconite is an iron potassium phyllosilicate (mica group) mineral of characteristic green color with very low weathering resistance and very friable. It is a greenish…

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…