Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.65-4.552.9-3.5
1
7.18
👆🏻
Fracture
Conchoidal
Conchoidal
Cleavage
None, but may exhibit slight parting
{110} Perfect, {???} Distinct, {???} Distinct
Mohs Hardness
7.5-85.5-6
2
10
👆🏻
Chemical Composition
(Mg,Zn)Al 2O 4Gemdat.org , Management Team (2012)
(Mg,Fe2+ ) 2(Mg,Fe2+ ) 5Si 8O 22(OH) 2Anthony et al , Handbook of mineralogy (2001)