Tenacity
-
Brittle
Solubility
-
H₂SO₄
Durability
-
-
Specific Gravity
2.812.74-3.00
1
7.18
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Fracture
Conchoidal
Uneven
Cleavage
{001} Perfect
Distinct on {0001} imperfect on {11 2 0}
Mohs Hardness
4.5-55-5.5
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
Na 4(Ca,Ce) 2(Fe,Mn,Y)ZrSi 8O 22(OH,Cl) 2Ulrich Henn and Claudio C.