Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.43-3.442.74-2.76
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
None Observed
{010} Perfect, {001} Distinct
Mohs Hardness
6.5-73.5-4
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Al) 6(Si,Al,B) 6O 20Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Fe3+ PO 4 · 2H 2OAnthony et al , Handbook of Mineralogy (2001)