Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.95-4.102.60-3.02
1
7.18
👆🏻
Fracture
Uneven
-
Cleavage
{110} Perfect, {110} Perfect, {110} Perfect
Perfect
Mohs Hardness
3.5-4-9999
2
10
👆🏻
Chemical Composition
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)