General science

General science

A variety of science subjects concerning the fundamental knowledge about different aspects of our world and their underlying principles.

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General science

Proustite

Science; General science

A mineral having composition Ag 3 AsS 3 and crystallising in the hexagonal system. It occurs in prismatic crystals terminated by steep ditrigonal pyramids, but is more commonly massive or in ...

A mineral having the composition SnO 2 . Cassiterite is the principal ore of tin. Its crystals are of the tetragonal rutile structure type, usually in prisms terminated by dipyramids. Twins with a ...

Pyrolusite

Science; General science

A mineral having composition MnO 2 . Pyrolusite is the most important ore of manganese. It crystallises in the tetragonal system but well-developed crystals (polianite) are rare. It is usually in ...

Melanterite

Science; General science

A mineral having composition FeSO 4 ·7H 2 O. Melanterite occurs mainly in green, fibrous or concretionary masses or in short, monoclinic, prismatic crystals (see illus. ). Fracture is conchoidal ...

Wollastonite

Science; General science

A mineral inosilicate with composition CaSiO 3 . It crystallises in the triclinic system in tabular crystals (see illus. ). More commonly it is massive, or in cleavable to fibrous aggregates. ...

Datolite

Science; General science

A mineral neosilicate, composition CaBSiO 4 (OH), crystallising in the monoclinic system. It usually occurs in crystals showing many faces and having an equidimensional habit. It may also be fine ...

Rhodonite

Science; General science

A mineral inosilicate with composition MnSiO 3 . Rhodonite crystallises in the triclinic system in crystals that are commonly tabular parallel to the base (see illus. ). More often it is in ...