Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.87-4.143.25-3.50
1
7.18
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Fracture
Subconchoidal, Conchoidal
Uneven
Cleavage
Poor on {120}, in traces on {001}
Distinct
Mohs Hardness
5.5-6-9999
2
10
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Chemical Composition
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 10Mg 2Al 4(SiO 4) 5(Si 2O 7) 2(OH) 4Ulrich Henn and Claudio C.