Tenacity
Brittle
Brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
1.796.86-7.03
1
7.18
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Fracture
Irregular/uneven
Subconchoidal, Uneven, Conchoidal, Irregular
Cleavage
Perfect on {10bar10}
{100} imperfect, {110} indistinct; partings on {111} or {011}
Mohs Hardness
2.56-7
2
10
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Chemical Composition
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)
SnO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references