Common feldspar mineral, a sodium aluminosilicate (NaAlSiO) that occurs most widely in pegmatites and acid igneous rocks such as granites. It may also be found in low-grade metamorphic rocks (those formed under relatively low temperature and pressure conditions) and in certain sedimentary rocks. Albite usually forms brittle, glassy crystals that may be colourless, white, yellow, pink, green, or black. It is used in the manufacture of glass and ceramics, but its primary geologic importance is as a rock-forming mineral.

This entry comes from Encyclopædia Britannica Concise.
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