Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.452.25-2.40
1
7.18
👆🏻
Fracture
Conchoidal
-
Cleavage
Perfect on {001}, good on {110}
perfect on {010}; good on {100}
Mohs Hardness
4-4.55-5.5
2
10
👆🏻
Chemical Composition
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
NaCa 2Al 5Si 5O 20 · 6H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references