Leucite

Leucite is a rock-forming mineral composed of potassium and aluminium tectosilicate K[AlSi2O6]. Crystals have the form of cubic icositetrahedra but, as first observed by Sir David Brewster in 1821, they are not optically isotropic, and are therefore pseudo-cubic. Goniometric measurements made by Gerhard vom Rath in 1873 led him to refer the crysta...
Found on http://en.wikipedia.org/wiki/Leucite

Leucite

• (n.) A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especially at Vesuvius. • (n.) A leucoplast.
Found on http://thinkexist.com/dictionary/meaning/leucite/

Leucite

Leu'cite (lū'sīt) noun [ Greek leyko`s white: confer French leucite .] 1. (Min.) A mineral having a glassy fracture, occurring in translucent trapezohedral crystals. It is a silicate of alumina and potash. It is found in the volcanic rocks of Italy, especial...
Found on http://www.encyclo.co.uk/webster/L/33

Leucite

Leucite is a rather rare mineral occurring only in igneous rocks and usually in recent lavas. It is found in rocks where the amount of silica in the magma was not sufficient to form feldspar. It is not found, therefore, in rocks that contain quartz. It's name is derived from the Greek word for ' white'. It has the formulae KAlSi2O6 and a relative h...
Found on http://www.probertencyclopaedia.com/browse/HL.HTM

leucite

one of the most important feldspathoid minerals, a potassium aluminosilicate (KAlSi2O6). It occurs only in igneous rocks, particularly ... [2 related articles]
Found on http://www.britannica.com/eb/a-z/l/39
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