Formula: SrB6O9(OH)2.3H2O
Origin of name: for G. Tunell, American geochemist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 14.36 Å, b = 8.20 Å, c = 9.93 Å, b = 113.9°
Colour: colourless
Diaphaneity: transparent
Luster: subvitreous to pearly on {100}
Habit: crystals prismatic and tabular, to 4 cm, fine-grained nodules
Hardness: 2.5
Specific gravity: 2.40
Cleavage: 2; {100} perfect, {001} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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