Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
1.795.9-6.3
1
7.18
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Fracture
Irregular/uneven
Conchoidal, Uneven
Cleavage
Perfect on {10bar10}
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
2.54.5-5
2
10
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Chemical Composition
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references