1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven
Conchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle
1.6 Cleavage
{100} Distinct, {001} Poor, {110} Poor
Perfect on {100}, imperfect on {001}
1.7 Mohs Hardness
1.8 Chemical Composition
Ca2Fe++Al2BO3Si4O12(OH)
PbCu(SO 4)(OH) 2Michael OâDonoghue , Gems, Sixth Edition (2006)