2 Physical Properties
2.2 Tenacity
Not Available
Not Available
2.4 Solubility
Not Available
Not Available
2.6 Durability
Not Available
Not Available
2.8 Specific Gravity
Not Available3.25-3.45
1
7.18
2.9 Fracture
Not Available
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009), Brittle, Uneven
2.11 Cleavage
Not Available
Good on {110}
2.13 Mohs Hardness
2.15 Chemical Composition
Not Available
Mg 3Al 6(Si,Al,B) 5O 21(OH)Walter Schumann , Gemstones of the world (2001) More from other references