Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.32-3.432.79-2.87
1
7.18
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Fracture
Conchoidal
Conchoidal
Cleavage
Poor on {110} and {100} very poor on {001}
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
Mohs Hardness
6-75.5-6
2
10
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Chemical Composition
Ca10(Mg,Fe)2Al4(SiO4)5(Si2O7)2(OH)4
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references