Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
4.28-4.421.65-1.99
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
Distinct on [010] and [100] poor on [101]
{010} Perfect, {110} Perfect
Mohs Hardness
5-5.52-2.5
2
10
👆🏻
Chemical Composition
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
NaCaB 5O 6(OH) 6 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)