Formula: Ca2B5SiO9(OH)5
Origin of name: For H. How, Canadian chemist and mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 12.78 Ǻ, b = 9.33 Ǻ, c = 8.60 Ǻ, β = 104.8°
Colour: White
Diaphaneity:
Luster: Subvitreous
Habit: Crystals tabular; compact nodular masses; chalk-like; earthy; scaly; porcelaneous
Hardness: 3.5
Specific gravity: 2.45
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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