Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.70-2.753.355-3.433
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
From the Greek for luster, for its pearly luster on the cleavage.
{???} Good, {???} Good
Mohs Hardness
4.5-5-9999
2
10
👆🏻
Chemical Composition
Al 2(PO 4)(OH) 3Michael OâDonoghue , Gems, Sixth Edition (2006)
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)