1 Physical Properties
2.2 Tenacity
Not Available
Not Available
2.3 Solubility
Not Available
Not Available
2.4 Durability
Not Available
Not Available
2.5 Specific Gravity
2.55-2.652.98-3.10
1
7.18
2.9 Fracture
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001), Brittle, Conchoidal
2.10 Cleavage
[1010] Poor
{100} Perfect, {110} Good, {011} Distinct
2.11 Mohs Hardness
2.12 Chemical Composition
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
LiAl(PO 4)(OH,F)Walter Schumann , Gemstones of the world (2001) More from other references