1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.34-3.442.74-2.90
1
7.18
1.5 Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Uneven, Gemstones (2009), Splintery
1.6 Cleavage
{111} Indistinct, {111} Indistinct, {111} Indistinct
Perfect on {100} and {001}
1.7 Mohs Hardness
1.8 Chemical Composition
(K,Cs)Al 4Be 4(B,Be) 12O 28Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca 2NaHSi 3O 9Ulrich Henn and Claudio C.