Grandidierite
Grandidierite is an extremely rare mineral and a gem that was first discovered in 1902 in southern Madagascar. General formula: (Mg, Fe2+)Al3(BO3)(SiO4)O2. It is an…
Geographic Minerals
Graftonite
Graftonite is an iron(II), manganese, calcium phosphate mineral with formula: (Fe2+, Mn, Ca)3(PO4)2. It is a mineral consisting of an iron manganese-calcium phosphate occurring in…
Goslarite: Properties and Occurrences
Goslarite is a hydrated zinc sulfate mineral (ZnSO4·7(H2O)) which was first found in the Rammelsberg mine, Goslar, Harz, Germany. It is a mineral that consists…
Gormanite: Properties and Occurrences
Gormanite is a phosphate mineral with the formula (Fe, Mg)4Al4(PO4)4(OH)6·2H2O. It is a rare mineral that occurs as fracture filling in phosphate-ironstone and in fractures…
Gordaite: Properties and Occurrences
Gordaite is a sulfate mineral composed primarily of hydrous zinc sodium sulfate chloride hydroxide with the formula: NaZn4(SO4)(OH)6Cl·6H2O. It is a trigonal-pyramidal mineral containing zinc,…
Gonnardite: Properties and Occurrences
Gonnardite is a comparatively rare, fibrous zeolite, natrolite subgroup. It is a mineral approximately Na2(Si3Al2)O10·2H2O consisting of a zeolite and occurring in radiating spherules. It…
Goldmanite: Properties and Occurrences
Goldmanite is a green or greenish-brown silicate mineral of the garnet group with a chemical formula of Ca3(V3+, Al, Fe3+)2(SiO4)3. It is an isometric-hexoctahedral mineral…
Goethite: Properties and Occurrences
Goethite is an iron-bearing hydroxide mineral of the diaspore group. It is found in soil and other low-temperature environments. It is a dark or yellowish-brown…
Gmelinite-Na
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
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
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: Properties and Occurrences
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…
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