Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.815.00-5.30
1
7.18
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Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
{001} Perfect
None, may show partings on {0001} and {10 1 1}
Mohs Hardness
4.5-56
2
10
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Chemical Composition
NaAl 3(PO 4) 2(OH) 4 · 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe 2O 3Arthur Thomas , Gemstones (2009)