Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.98-2.992.9-3.5
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
(010) Distinct to good
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
5.55.5-6
2
10
👆🏻
Chemical Composition
NaAl 3(PO 4) 2(OH) 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)