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leucite




leucite
Leucite is a gray or white feldspar mineral – a potassium aluminum silicate (KAl(SiO3)2). Unstable at high pressures, it has a restricted occurrence. Leucite can be found in potassium-rich lava flows and volcanic plugs. It forms crystals having 24 equal faces. Hardness 5.5–6, relative density 2.5.

Leucite crystal and crystal structure
A leucite crystal and crystal structure

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   • GEOLOGY AND PLANETARY SCIENCE