Tenacity
-
Sectile
Solubility
-
Soluble
Durability
-
-
Specific Gravity
1.98-2.506.13
1
7.18
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Fracture
ConchoidalWalter Schumann
Conchoidal
Cleavage
None
Distinct on {001} and {110}, indistinct on {100}
Mohs Hardness
5.5-6.52-3
2
10
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Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Pb 2(CO 3)Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references