Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.59-2.603.26-3.36
1
7.18
👆🏻
Fracture
-
Conchoidal
Cleavage
{001} Perfect, {110} Distinct, {101} Distinct
Good on {100}
Mohs Hardness
6-76.5-7
2
10
👆🏻
Chemical Composition
Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)
(Ca,Fe,Mn,Mg) 3Al 2BSi 4O 15(OH)Walter Schumann , Gemstones of the world (2001) More from other references