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Crystals

Byshapes

A crystal or crystalline solid is a solid material whose constituents are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions, also defined as a piece of a homogeneous solid substance having a natural geometrically regular form with a symmetrically arranged plane faces.

Some crystals have formed by magmatic and metamorphic processes, giving origin to large masses of crystalline rock. The vast majority of igneous rocks are formed from molten magma and the degree of crystallization depends primarily on the conditions under which they solidified. Many living organisms are able to produce crystals, for example, calcite and aragonite in the case of most molluscs or hydroxylapatite in the case of vertebrates.

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