Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.25-2.405.05-5.22
1
7.18
👆🏻
Fracture
-
Uneven
Cleavage
perfect on {010}; good on {100}
None
Mohs Hardness
5-5.55.5-6
2
10
👆🏻
Chemical Composition
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Zn,Mn2+ ,Fe2+ )(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)