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

Chabazite

Science; General science

A mineral belonging to the zeolite family of silicates. It commonly occurs in well-crystallized groupings of crystals with external rhombohedral symmetry (point group 3 2/ m ) with nearly cubic ...

Calcite

Science; General science

A mineral composed of calcium carbonate (CaCO 3 ); one of the most common and widespread minerals in the Earth's crust. Calcite may be found in a great variety of sedimentary, metamorphic, and ...

Pentlandite

Science; General science

A mineral having composition (Fe,Ni) 9 S 8 . Pentlandite is the major ore of nickel. It crystallises in the isometric system, but crystals are rare. It is usually massive, showing a well-defined ...

Stilbite

Science; General science

A mineral belonging to the zeolite family of silicates. It crystallises in the monoclinic system in crystals that are tabular parallel to the side pinacoid. Most characteristic are sheaflike ...

A mineral belonging to the zeolite family of silicates and crystallising in the monoclinic system. It usually occurs in crystals with prominent side pinacoid, often having a diamond shape. There is ...

Diamond

Science; General science

A mineral composed entirely of carbon; the hardest substance known. Diamond is a polymorph of carbon; lonsdaleite, another polymorph, is sometimes referred to as hexagonal diamond. Diamond is found ...

Wulfenite

Science; General science

A mineral consisting of lead molybdate, PbMoO 4 . Wulfenite occurs commonly in yellow, orange, red, and grayish-white crystals. They may be tetragonal, tabular (see illus. ), or pyramidal, with a ...