Tenacity
-
Brittle
Solubility
-
Soluble
Durability
-
-
Specific Gravity
3.60-3.613.30-3.50
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, ConchoidalWalter Schumann, Conchoidal
Cleavage
Imperfect/fair/absent
Perfect on {110}, poor on {101}, {001} rare
Mohs Hardness
8-8.55
2
10
👆🏻
Chemical Composition
Mg 3Al 8BeO 16Walter Schumann , Gemstones of the world (2001) More from other references
Zn 4Si 2O 7(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references