Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.04-3.172.60-2.65
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal
Cleavage
{001} Indistinct, {???} Indistinct
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
5.56-6.5
2
10
👆🏻
Chemical Composition
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)