Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.60-3.026.46-6.57
1
7.18
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Fracture
-
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Perfect
Good [110] and [021]
Mohs Hardness
-99993-3.5
2
10
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Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references