Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.74-2.762.36
1
7.18
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Fracture
Uneven
Uneven, Subconchoidal, Fibrous
Cleavage
{010} Perfect, {001} Distinct
[110] perfect, [101] good, [010] distinct
Mohs Hardness
3.5-43.5-4
2
10
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Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references