Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.823.98-4.04
1
7.18
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Fracture
-
Conchoidal
Cleavage
Perfect in one direction, indistinct in one direction
Imperfect, poor one {100}
Mohs Hardness
64.5-5
2
10
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Chemical Composition
K2Na(Ca,Mn)2Ti[O|Si7O18(OH)]
Zn 2(AsO 4)(OH) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references