1 Physical Properties
1.2 Tenacity
1.4 Solubility
Not Available
Poorly soluble in dilute HCl
1.6 Durability
Not Available
Not Available
1.7 Specific Gravity
4.28-4.422.80-2.95
1
7.18
1.8 Fracture
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Metallic
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle, Conchoidal
1.9 Cleavage
Distinct on [010] and [100] poor on [101]
Perfect on {10 1 1}, rhombohedral cleavage
1.10 Mohs Hardness
1.15 Chemical Composition
PbCa 3Zn 4(SiO 4) 4Anthony et al , Handbook of mineralogy (2001)
CaMg(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references