1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
2.60-3.022.90-3.14
1
7.18
1.13 Fracture
Not Available
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009), Brittle
1.14 Cleavage
Not Available
Imperfect; basal
1.15 Mohs Hardness
1.16 Chemical Composition
(Mg,Fe2+ ) 5Al(Si 3Al)O 10(OH) 8Anthony et al , Handbook of mineralogy (2001)
(Be,Cs) 3Al 2Si 6O 18 · 0.5H 2OUlrich Henn and Claudio C.