Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
2.55-2.633.30-3.50
1
7.18
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Fracture
Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{001} Perfect, {010} Good
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
6-6.55
2
10
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Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references