Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.30-2.602.9-3.5
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
{111} Imperfect
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
5.5-65.5-6
2
10
👆🏻
Chemical Composition
Na 4AlBeSi 4O 12ClMichael 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)