Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.25-3.452.90-2.98
1
7.18
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Fracture
Conchoidal, Uneven
Conchoidal
Cleavage
Good on {110}
Rare tabular and prismatic crystals. Usually occurs as fibrous, parallel veins that break off into cleavage fragments.
Mohs Hardness
6.53.5
2
10
👆🏻
Chemical Composition
Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references
CaSO 4Michael OâDonoghue , Gems, Sixth edition (2006) More from other references