Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.95-4.102.97-3.14
1
7.18
👆🏻
Fracture
Uneven
Uneven, Conchoidal
Cleavage
{110} Perfect, {110} Perfect, {110} Perfect
{1011} Indistinct
Mohs Hardness
3.5-4-9999
2
10
👆🏻
Chemical Composition
(Zn,Fe)SMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca(Mg 3)MgAl 5(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012)