Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.04-3.173.90-4.00
1
7.18
👆🏻
Fracture
Uneven
Conchoidal
Cleavage
{001} Indistinct, {???} Indistinct
Perfect on {001}, good on {210}, poor on {010}
Mohs Hardness
5.53-3.5
2
10
👆🏻
Chemical Composition
(Mg,Fe)Al 2(PO 4) 2(OH) 2Arthur Thomas , Gemstones (2009) More from other references
SrSO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references