Tenacity
-
Brittle
Solubility
-
-
Durability
-
-
Specific Gravity
2.90-3.106.50-7.00
1
7.18
👆🏻
Fracture
Uneven, Conchoidal
Irregular, Conchoidal
Cleavage
Poor/indistinct on {1120} and {1011}
On {011}, distinct; on {001}, {013}, indistinct
Mohs Hardness
73
2
10
👆🏻
Chemical Composition
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references
PbMoO 4Walter Schumann , Gemstones of the world (2001)