Formula: Be2BO3(OH)
Origin of name: For Axel Hamberg, Swedish mineralogist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning: On {11)}
Unit cell: a = 9.755 Ǻ, b = 12.20 Ǻ, c = 4.426 Ǻ
Colour: Colourless, white, grayish white, yellowish white
Diaphaneity:
Luster: Vitreous to dull
Habit: Crystals prismatic, flattened
Hardness: 7.5
Specific gravity: 2.37
Cleavage: 2; {010} perfect, {100} good
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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