Formula: Be2(BO3)(OH,F) . H2O
Origin of name: From composition, beryllium borite
Crystal system: Hexagonal
Crystal class: 3
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity:
Luster: Vitreous
Habit:
Hardness: 3
Specific gravity: 2.20
Cleavage: 1; {0001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: Data are for berborite-1T; there are also -2T and -2H polytypes
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