Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.79-2.875.6-5.76
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{010} perfect; {100} good, interrupted; {101} indistinct; {001} in traces
[001] perfect; [100] distinct
Mohs Hardness
5.5-62.5-3
2
10
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Chemical Composition
NaBePO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Pb 5Cu 2(SO 4) 3(CO 3)(OH) 6Anthony et al , Handbook of mineralogy (2001)