Tenacity
Brittle
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
2.752.9-3.5
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Conchoidal
Cleavage
Imperfect on {110}
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
5.55.5-6
2
10
👆🏻
Chemical Composition
(Na,Ca) 8Al 6Si 6O 24(SO 4,S,Cl) 2Ulrich Henn and Claudio C.
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)