Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.652.9
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
Perfect on {001}, very good on {010}, imperfect on {110}
{???} Indistinct
Mohs Hardness
6-6.54.5
2
10
👆🏻
Chemical Composition
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)
(Zn,Cu)Al 6(PO 4) 4(OH) 8 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)