Formula: (Ca,Na)2Be(Si,Al)2(O,OH,F)7
Origin of name: From Greek for honey and to appear
Crystal system: Tetragonal
Crystal class: -4
Twinning:
Unit cell:
Colour: Yellow, colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals thin tabular or short square pyramids; tabular or lamellar aggregates
Hardness: 5 to 5.5
Specific gravity: 3.0
Cleavage: 3; {010} perfect, {001} distinct, {110} indistinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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