Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.342.45
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
None
Perfect on {001}, good on {110}
Mohs Hardness
-99994-4.5
2
10
👆🏻
Chemical Composition
(Cs,K,Rb)Al 4Be 4(B,Be) 12O 28Anthony et al , Handbook of mineralogy (2001)
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)