Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.74-2.762.60-2.65
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal
Cleavage
{010} Perfect, {001} Distinct
Perfect on {001}, very good on {010}, imperfect on {110}
Mohs Hardness
3.5-46-6.5
2
10
👆🏻
Chemical Composition
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)
NaAlSi 3O 8Michael OâDonoghue , Gems, Sixth Edition (2006)