1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.4 Solubility
Not Available
Not Available
1.7 Durability
Not Available
Not Available
1.9 Specific Gravity
3.28-3.313.355-3.433
1
7.18
1.17 Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Uneven, Uneven, ConchoidalAnthony et al, Handbook of mineralogy (2001)
1.18 Cleavage
None observed
{???} Good, {???} Good
1.19 Mohs Hardness
6.5-7.5Not Available
2
10
1.20 Chemical Composition
Al 6B 5O 15(F,OH) 3Ulrich Henn and Claudio C.
(Ca,Mn2+ ,Fe2+ ) 3Al 2BSi 4O 15(OH)Anthony et al , Handbook of mineralogy (2001)