Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.55-2.636.46-6.57
1
7.18
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Fracture
Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{001} Perfect, {010} Good
Good [110] and [021]
Mohs Hardness
6-6.53-3.5
2
10
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Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references