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phenacite




phenacite
Or phenakite, beryllium silicate, (Be2SiO4). an orthosilicate mineral found in pegmatities and high-temperature veins. It has hexagonal system rhombohedral crystals, and is either colorless or glassy white, yellow, red or brown in color. It is sometimes used as a gem. Hardness 7.5–8; relative density 3.


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   • GEOLOGY AND PLANETARY SCIENCE