phenakite

noun
phen·​a·​kite | \ˈfe-nə-ˌkīt, ˈfē-\
variants: or phenacite \ ˈfe-​nə-​ˌsīt , ˈfē-​ \

Definition of phenakite 

: a hard glassy mineral that consists of a silicate of beryllium and occurs especially in rhombohedral crystals

First Known Use of phenakite

circa 1834, in the meaning defined above

History and Etymology for phenakite

German Phenakit, from Greek phenak-, phenax deceiver; from its being easily mistaken for quartz

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The first known use of phenakite was circa 1834

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