Formula: Mg4Al6(Si,Al,B)5O21(OH)
Origin of name: For A. Kornerup, Danish geologist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 16.00 Ǻ, b = 13.71 Ǻ, c = 6.70 Ǻ
Colour: Colourless, white, pink, greenish yellow, green,
Diaphaneity:
Luster: Vitreous
Habit:
Hardness: 6 to 7
Specific gravity: 3.27
Cleavage: 1; {110} imperfect to distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with prismatine
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