Tenacity
Sectile
-
Solubility
Soluble
-
Durability
-
-
Specific Gravity
6.133.355-3.433
1
7.18
👆🏻
Fracture
Conchoidal
Uneven
Cleavage
Distinct on {001} and {110}, indistinct on {100}
{???} Good, {???} Good
Mohs Hardness
2-3-9999
2
10
👆🏻
Chemical Composition
Pb 2(CO 3)Cl 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)