1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Handbook of mineralogy (2001)
Conchoidal, ConchoidalWalter Schumann, Gemstones of the world (2001), Brittle
1.6 Cleavage
None
Distinct on {11 2 0}, imperfect on {10 1 1}
1.7 Mohs Hardness
1.8 Chemical Composition
(Ca,Mn2+ ) 2(SiO 3OH)(OH)Anthony et al , Handbook of Mineralogy (2001)
Be 2SiO 4Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references