Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
22.98-3.10
1
7.18
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Fracture
Conchoidal, Uneven
Sub-Conchoidal, Irregular/uneven, Uneven, Conchoidal
Cleavage
Imperfect on {001}, indistinct on {011}
[100] Perfect, [110] Good, [011] Distinct
Mohs Hardness
2.5-36
2
10
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Chemical Composition
PbWO4
(Li,Na)Al(PO 4)(F,OH)Michael OâDonoghue , Gems, Sixth edition (2006) More from other references