Gunningite: Properties and Occurrences
Gunningite is one of the minerals in the Kieserite group, with the chemical formula (Zn, Mn2+)SO4·H2O. It is rare. It is found in dry areas…
Geographic Minerals
Guilleminite
Guilleminite (Ba(UO2)3(SeO3)2(OH)4•3H2O) is a uranium mineral named by R. Pierrot, J. Toussaint, and T. Verbeek in 1965 in honor of Jean Claude Guillemin (1923–1994), a…
Gugiaite: Properties and Occurrences
Gugiaite is a melilite mineral, named for the Chinese village of Gugia where it was first discovered. Its chemical formula is Ca2BeSi2O7. It is a…
Guettardite: Properties and Occurrences
Guettardite is a rare arsenic-antimony lead sulfosalt mineral with formula Pb(Sb, As)2S4. It is a monoclinic-prismatic grayish black mineral containing antimony, arsenic, lead, and sulfur.…
Grunerite: Properties and Occurrences
Grunerite is a mineral of the amphibole group of minerals with formula Fe7Si8O22(OH)2. It is an iron-rich amphibole related to cummingtonite. The origin of the…
Groutite: Properties and Occurrences
Groutite is a manganese oxide mineral with formula Mn3+O(OH). It is a mineral consisting of manganese, hydrogen, and oxygen, polymorphous with manganite, and belonging to…
Grossular: Properties and Occurrences
Grossular is a calcium-aluminum species of the garnet group of minerals. It is a mineral of the garnet group, consisting essentially of calcium aluminum silicate.…
Grossite: Properties and Occurrences
Grossite is a calcium aluminum oxide mineral with formula CaAl4O7. It is a monoclinic-prismatic mineral containing aluminum, calcium, and oxygen. It is a colorless to…
Greigite: Properties and Occurrences
Greigite is an iron sulfide mineral with formula Fe3S4 (Iron(II, III) sulfide). It is the sulfur equivalent of the iron oxide magnetite (Fe3O4). It is…
Greifensteinite
Greifensteinite is beryllium phosphate mineral with formula: Ca2Fe25+Be4(PO4)6(OH)4·6H2O. It is a monoclinic-prismatic dark olive green mineral containing aluminum, beryllium, calcium, hydrogen, iron, magnesium, manganese, oxygen,…
Gregoryite: Properties and Occurrences
Gregoryite is an anhydrous carbonate mineral that is rich in potassium and sodium with the formula: [(Na2, K2, Ca)CO3]. It is a mineral containing calcium,…
Greenockite: Properties and Occurrences
Greenockite is a rare cadmium bearing metal sulfide mineral consisting of cadmium sulfide (CdS) in crystalline form. Greenockite crystallizes in the hexagonal system. Although it…
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