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

A mineral consisting of calcium tungstate, CaWO 4 . Scheelite occurs in colourless to white, tetragonal crystals (see illus. ); it may also be massive and granular. Its fracture is uneven, and its ...

Topaz

Science; General science

A mineral best known for its use as a gemstone. Crystals are usually colourless but may be red, yellow, green, blue, or brown. The wine-yellow variety is the one usually cut and most highly prized ...

Millerite

Science; General science

A mineral having composition NiS and crystallising in the hexagonal system. Millerite usually occurs in hairlike tufts and radiating groups of slender to capillary crystals (see illus. ). There is ...

Chrysoberyl

Science; General science

A mineral having composition BeAl 2 O 4 and crystallising in the orthorhombic system. Chrysoberyl crystals are usually tabular parallel to the front pinacoid and frequently in pseudohexagonal twins ...

Orpiment

Science; General science

A mineral having composition As 2 S 3 and crystallising in the monoclinic system. Crystals are small, tabular, and rarely distinct (see illus. ); the mineral occurs more commonly in foliated or ...

Pectolite

Science; General science

A mineral inosilicate with composition Ca 2 NaSi 3 O 8 (OH), crystallising in the triclinic system. Crystals are usually acicular in radiating aggregates (see illustration ). There is perfect ...

Greenockite

Science; General science

A mineral having composition CdS (cadmium sulfide) and crystallising in the hexagonal system (dihexagonal pyramidal class). Pyramidal crystals are rare, and greenockite usually occurs as earthy ...