1 Physical Properties
1.1 Tenacity
1.1 Solubility
1.4 Durability
Not Available
Not Available
1.6 Specific Gravity
1.16 Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), (e.g. graphite).
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
1.17 Cleavage
Distinct on {001} and {110}, indistinct on {100}
Imperfect; basal
1.18 Mohs Hardness
1.19 Chemical Composition
Pb 2(CO 3)Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.