Tenacity
-
-
Solubility
-
Partly soluble in HCl.
Durability
-
-
Specific Gravity
2.55-2.633.32-3.43
1
7.18
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Fracture
Uneven
Conchoidal
Cleavage
{001} Perfect, {010} Good
{100} perfect; {110} and {1 1 0} good; {010} poor
Mohs Hardness
6-6.55.5-6
2
10
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Chemical Composition
KAlSi 3O 8Arthur Thomas , Gemstones (2009)
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references