Formula: Be2SiO4
Origin of name: from Greek for deceiver
Crystal system: hexagonal
Crystal class: -3
Twinning: about [0001] axis, penetration
Unit cell: a = 12.47 Å, c = 8.25 Å
Colour: colourless, yellow, pink, pinkish red, brown, bluish
Diaphaneity:
Luster: vitreous
Habit: crystals rhombohedral, prismatic or sometimes long prismatic to acicular, granular, acicular columnar aggregates
Hardness: 7.5 to 8
Specific gravity: 2.93 to 3.0
Cleavage: 2; {11-20} distinct, {10-11} imperfect
Tenacity: conchoidal, brittle
Streak:
Synonyms/varieties: phenacite
Comments:
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