Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.25-2.402.45
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
perfect on {010}; good on {100}
Perfect on {001}, good on {110}
Mohs Hardness
5-5.54-4.5
2
10
👆🏻
Chemical Composition
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)