
1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone 5) Gemstone mineral 6) Jewel 7) Jewel mineral 8) Mineral jewel 9) Mineral gemstone 10) Polished mineral 11) Polished jewel 12) Precious jewel 13) Precious gem 14) Prized stone 15) Precious gemstone 16) Prized mineral 17) Precious stone
Found on
https://www.crosswordclues.com/clue/phenakite

Phenakite or phenacite is a fairly rare nesosilicate mineral consisting of beryllium orthosilicate, Be2SiO4. Occasionally used as a gemstone, phenakite occurs as isolated crystals, which are rhombohedral with parallel-faced hemihedrism, and are either lenticular or prismatic in habit: the lenticular habit is determined by the development of faces ...
Found on
http://en.wikipedia.org/wiki/Phenakite

rare mineral, beryllium silicate, Be2SiO4, used as a gemstone. Phenakite has long been known from the emerald and chrysoberyl mine on the Takovaya ...
Found on
http://www.britannica.com/eb/a-z/p/55

Phenakite has the formulae Be2SiO4 and a relative hardness of 8. It is a rare mineral found in pegmatite dikes associated with topaz, beryl, and apatite. From the Greek word for 'a deceiver' in that it can be mistaken for quartz.
Found on
http://www.probertencyclopaedia.com/browse/HP.HTM
No exact match found.