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Related to phenacite: Petalite
phen·a·cite(fĕn′ə-sīt′) or phen·a·kite (-kīt′)
A natural beryllium silicate, Be2SiO4, occurring as vitreous crystals sometimes used as gems.
[Greek phenāx, phenāk-, impostor + -ite.]
(Minerals) a colourless or white glassy mineral consisting of beryllium silicate in hexagonal crystalline form: occurs in veins in granite. Formula: Be2SiO4
[C19: from Greek phenax a cheat, because of its deceptive resemblance to quartz]