Tenacity
Slightly sectile
Brittle
Solubility
1.04 x 10−25 g per 100 ml water (Ksp at 25°C = 2 x 10−32)
-
Durability
-
-
Specific Gravity
21.79
1
7.18
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Fracture
Uneven
Irregular/uneven
Cleavage
Prismatic {10 1 0}, perfect
Perfect on {10bar10}
Mohs Hardness
2-2.52.5
2
10
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Chemical Composition
HgSMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)