1 Physical Properties
1.1 Tenacity
1.2 Solubility
Partly soluble in HCl.
Soluble
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
3.32-3.432.20-2.23
1
7.18
1.5 Fracture
ConchoidalArthur Thomas, Gemstones (2009), ConchoidalArthur Thomas, Gemstones (2009)
Irregular/uneven, UnevenAnthony et al, Handbook of mineralogy (2001), Brittle, Uneven
1.6 Cleavage
{100} perfect; {110} and {1 1 0} good; {010} poor
Perfect on {110} and {1 1 0}
1.7 Mohs Hardness
1.5 Chemical Composition
(Ca,Mn2+ )Si 3O 9Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
CaAl 2Si 3O 10 · 3H 2OUlrich Henn and Claudio C.