Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.74-2.766.46-6.57
1
7.18
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Fracture
Uneven
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{010} Perfect, {001} Distinct
Good [110] and [021]
Mohs Hardness
3.5-43-3.5
2
10
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Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
PbCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references