1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone 5) Gemstone mineral 6) Jewel mineral 7) Jewel 8) Mineral gemstone 9) Mineral jewel 10) Polished jewel 11) Polished mineral 12) Precious stone 13) Precious gem 14) Precious gemstone 15) Prized mineral 16) Precious jewel 17) Prized stone
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https://www.crosswordclues.com/clue/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...
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http://en.wikipedia.org/wiki/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.
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http://thinkexist.com/dictionary/meaning/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
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...
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http://www.encyclo.co.uk/webster/L/33
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...
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http://www.probertencyclopaedia.com/browse/HL.HTM
(Potassium Aluminum Silicate) Leucite is a popular and interesting mineral. Its name comes from the greek word for `white` in allusion to its typical color. At high temperatures, leucite is isometric and will form the isometric trapezohedron crystal form. Interestingly, as leucite cools, the isometric structure becomes unstable...
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https://www.encyclo.co.uk/local/23719
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