Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
1.793.16-3.23
1
7.18
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Fracture
Irregular/uneven
Conchoidal, Uneven, Conchoidal to uneven
Cleavage
Perfect on {10bar10}
[0001] indistinct, [1010] indistinct
Mohs Hardness
2.55
2
10
👆🏻
Chemical Composition
Ca6(Al,Si)2(SO4)2B(OH)4(OH,O)12•26(H2O)
Ca 5(PO 4) 3(F,OH,Cl)Walter Schumann , Gemstones of the world (2001) More from other references