Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
-99995.9-6.3
1
7.18
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Fracture
-
Conchoidal, Uneven
Cleavage
{???} Good, {???} Good, {???} Distinct
On {101}, distinct; on {112}, interrupted; on {001}, indistinct
Mohs Hardness
-99994.5-5
2
10
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Chemical Composition
(Na,Ca)2BeSi2(O,OH)7
CaWO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references