ˈfenəˌkīt noun
or phen·a·cite -ˌsīt
( -s )
Etymology: Swedish phenakit, from Greek phenak-, phenax deceiver + Swedish -it -ite; from its being easily mistaken for quartz
: a colorless, wine-yellow, rose-red, or brown glassy mineral that is a beryllium silicate Be 2 SiO 4 , occurs in rhombohedral crystals, and is sometimes used as a gem (hardness 7.5-8, specific gravity 2.97-3.00)