Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.763.25-3.50
1
7.18
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Fracture
Uneven
Conchoidal, Fibrous
Cleavage
{010} Perfect, {001} Distinct
{001} perfect and {100} imperfect
Mohs Hardness
3.5-46-7
2
10
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Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
CaAl 2(Fe3+ ,Al)Si 3O 12(OH)Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references