Tenacity
Brittle
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.33-2.376.50-7.00
1
7.18
👆🏻
Fracture
ConchoidalWalter Schumann
Irregular, Conchoidal
Cleavage
Perfect on {010}, good on {100}
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
7.53
2
10
👆🏻
Chemical Composition
Be 2BO 3(OH)Ulrich Henn and Claudio C.
PbMoO 4Walter Schumann , Gemstones of the world (2001)