Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
6.5-7.12.90-2.98
1
7.18
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Fracture
Uneven, Conchoidal
Conchoidal, ConchoidalWalter Schumann
Cleavage
Imperfect- [10 1 1]
Distinct on {11 2 0}, imperfect on {10 1 1}
Mohs Hardness
3.5-47.5-8
2
10
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Chemical Composition
Pb 5(PO 4) 3ClArthur Thomas , Gemstones (2009)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references