Phenacite

• (n.) A glassy colorless mineral occurring in rhombohedral crystals, sometimes used as a gem. It is a silicate of glucina, and receives its name from its deceptive similarity to quartz.
Found on http://thinkexist.com/dictionary/meaning/phenacite/

Phenacite

Phen'a·cite noun [ Greek ..., ..., impostor, deceiver.] (Min.) A glassy colorless mineral occurring in rhombohedral crystals, sometimes used as a gem. It is a silicate of glucina, and receives its name from its deceptive similarity to quartz.
Found on http://www.encyclo.co.uk/webster/P/71

Phenacite

Beryllium orthosilicate
Found on http://www.translationdirectory.com/glossaries/glossary075.htm
No exact match found