Science

“Trigon” is Greek for the triangle, and “metric” is Greek for measurement. The trigonometric ratios are special measurements of a right triangle (a triangle with…

Botallackite, chemical formula Cu2(OH)3Cl is a secondary copper mineral, named for its type locality at the Botallack mine, St Just in Penwith, Cornwall. It was…

Bornite, also known as peacock ore, is a sulfide mineral with chemical composition Cu5FeS4 that crystallizes in the orthorhombic system (pseudo-cubic). It was named after…

Borax, also known as sodium borate, sodium tetraborate, or disodium tetraborate, is an important boron compound, a mineral, and a salt of boric acid. It…

Boracite is a magnesium borate mineral with formula: Mg3B7O13Cl. It occurs as blue-green, colorless, gray, and yellow to white crystals in the orthorhombic – pyramidal…

Bonaccordite is a rare mineral discovered in 1974. Its chemical formula is Ni2FeBO5 and it is a mineral of the ludwigite group. It is an…

Boltwoodite is a hydrated potassium uranyl silicate mineral with formula HK(UO2)(SiO4)·1.5(H2O). It was named after Bertram Borden Boltwood (1870-1927), radiochemist of Yale University, New Haven,…

Boleite is a complex halide mineral with formula: KPb26Ag9Cu24(OH)48Cl62. It was first described in 1891 as an oxychloride mineral. It was named for its type…

Boehmite or böhmite is an aluminum oxide hydroxide (γ-AlO(OH)) mineral, a component of the aluminum ore bauxite. It is one of the three component minerals…

Quotient Relations of Trigonometric Ratios The quotient identities tell us relationships among functions in threes: the tangent function is the quotient of the sine and…

Bobfergusonite is a mineral with formula Na2Mn5FeAl(PO4)6. The mineral varies in color from green-brown to red-brown. It was discovered in 1986 in Manitoba, Canada, and…

Blossite is an anhydrous copper vanadate mineral with the formula: Cu2+2V5+2O7. It is a very rare sublimate, probably formed between 100–2000C, from the outer sulfate…