Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.372.55-2.63
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Uneven
Cleavage
Perfect on {010}, good on {100}
{001} Perfect, {010} Good
Mohs Hardness
7.56-6.5
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
KAlSi 3O 8Arthur Thomas , Gemstones (2009)