Geographic Minerals

Bukovite is a rare selenide mineral with formula Tl2Cu3FeSe4. It is a brown to black metallic mineral which crystallizes in the tetragonal system. It was…

Buddingtonite is ammonium feldspar with the formula: NH4AlSi3O8 (note: some sources add 0.5H2O to the formula). It is the ammonia feldspar originally found at this…

Brushite is a phosphate mineral with the chemical formula CaHPO4·2H2O. It was named after Professor George Jarvis Brush (1831–1912), an American mineralogist associated with Yale…

Brucite is the mineral form of magnesium hydroxide, with the chemical formula Mg(OH)2. It is the mineral form of magnesium hydroxide, first discovered in 1824…

Brownmillerite is a rare oxide mineral with chemical formula Ca2(Al, Fe)2O5. It is named for Lorrin Thomas Brownmiller (1902–1990), chief chemist of the Alpha Portland…

Brookite is the orthorhombic variant of titanium dioxide, TiO2, which occurs in four natural polymorphic forms (minerals with the same composition but different structure). It…

Bronzite is a member of the pyroxene group of minerals, belonging to enstatite and hypersthene to the orthorhombic series of the group. Rather than a…

Brownleeite is a silicide mineral with chemical formula MnSi. It was discovered by researchers of the Johnson Space Center in Houston while analyzing the Pi…

Bromellite, whose name derives from the Swedish chemist Magnus von Bromell (1670–1731), is a white oxide mineral, found in complex pegmatitic manganese-iron deposits, but is…

Bromyrite or bromargyrite is a natural mineral form of silver bromide found mainly in Mexico and Chile. Hardness is 1.5 to 2. Related are chlorargyrite…

Brochantite is a sulfate mineral, one of a number of cupric sulfates. Its chemical formula is Cu4SO4(OH)6. It is formed from the oxidation of copper…

Silicate perovskite (or bridgmanite) is (Mg, Fe)SiO3 and CaSiO3 (calcium silicate) when arranged in a perovskite structure. Silicate perovskites are mainly found in the lower…