Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.28-4.422.52-2.60
1
7.18
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Fracture
Conchoidal
Uneven, Conchoidal
Cleavage
Distinct on [010] and [100] poor on [101]
{0001} Imperfect, {1120} Imperfect
Mohs Hardness
5-5.55.5-6
2
10
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Chemical Composition
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
KCa 2AlBe 2Si 12O 30 · 0.5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references