Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
4.28-4.422.45
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
Distinct on [010] and [100] poor on [101]
Perfect on {001}, good on {110}
Mohs Hardness
5-5.54-4.5
2
10
👆🏻
Chemical Composition
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
KNa 4Ca 4Si 8O 18(CO 3) 4(OH,F) · H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)