Tenacity
-
-
Solubility
HCl soluble
insoluble
Durability
-
-
Specific Gravity
3.712.36
1
7.18
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Fracture
Uneven
Uneven, Subconchoidal, Fibrous
Cleavage
{10 1 1} Good
[110] perfect, [101] good, [010] distinct
Mohs Hardness
4.5-53.5-4
2
10
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Chemical Composition
(Ni,Mg,Fe++)CO3
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references