Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-3.023.1-3.2
1
7.18
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Fracture
Uneven
-
Cleavage
{001} Perfect
Vitreous, pearly on cleavage
Mohs Hardness
2-2.53-4
2
10
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Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references