Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.60-2.642.33-2.37
1
7.18
👆🏻
Fracture
Uneven, Splintery, Conchoidal
ConchoidalWalter Schumann
Cleavage
Absent
Perfect on {010}, good on {100}
Mohs Hardness
6.5-77.5
2
10
👆🏻
Chemical Composition
SiO 2Arthur Thomas , Gemstones (2009)
Be 2BO 3(OH)Ulrich Henn and Claudio C.