Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
3.82-4.003.70-3.90
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
{???} Indistinct
Perfect on {011}, fair on {100}, poor on {110}
Mohs Hardness
5.53.5-4
2
10
👆🏻
Chemical Composition
Mn2+9(SiO 4) 4(OH,F) 2Anthony et al , Handbook of mineralogy (2001)
Cu 3(OH) 2(CO 3) 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references