Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.703.87-4.14
1
7.18
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Fracture
Uneven, Conchoidal
Subconchoidal, Conchoidal
Cleavage
Perfect on {100}
Poor on {120}, in traces on {001}
Mohs Hardness
4.55.5-6
2
10
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Chemical Composition
Ca 3Al 2(SO 4)(F,OH) 10Ulrich Henn and Claudio C.
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references