Science

Aragonite is a carbonate mineral, one of the two most common, naturally occurring, crystal forms of calcium carbonate, CaCO3 (the other forms being the minerals…

The name apophyllite refers to a specific group of phyllosilicates, a class of minerals. Apophyllite, whose name roughly means “to leaf apart” in Greek, is…

Mathematics Logarithms In mathematics, logarithms were developed for making complicated calculations simple. In mathematics, the logarithm is the inverse operation to exponentiation, just as division…

Aphthitalite is a potassium sulfate mineral with the chemical formula: (K, Na)3Na(SO4)2. It is a mineral consisting of potassium sodium sulfate occurring massive or in…

An apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite, and chlorapatite, with high concentrations of OH−, F−, and Cl− ions, respectively,…

Apachite is a copper silicate mineral with a general formula of Cu9Si10O29·11H2O. It is a phonolitic rock containing abundant amphibole and aenigmatite associated with the…

Cross multiplication to solve proportions Cross multiplying is a way to solve an equation that involves a variable as part of two fractions set equal…

Antlerite is a greenish hydrous copper sulfate mineral, with the formula Cu3(SO4)(OH)4. It has been an important ore of copper and forms nice mineral specimens.…

A polynomial of the second degree is generally called a quadratic polynomial. In elementary algebra, the quadratic formula is the solution of the quadratic equation. There…

A ratio is a statement of how two numbers compare. It is a comparison of the size of one number to the size of another…

Antitaenite is a meteoritic metal alloy mineral composed of iron and nickel, 20–40% Ni (and traces of other elements) that has a face-centered cubic crystal…

Antimony is a chemical element with symbol Sb (from Latin: stibium) and atomic number 51. A lustrous grey metalloid, it is found in nature mainly…