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
2.5 Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, UnevenArthur Thomas, Gemstones (2009), Splintery
2.6 Cleavage
Not Available
perfect along {110}.
2.7 Mohs Hardness
1.21 Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
Ca 2(Mg,Fe) 5Si 8O 22(OH) 2Ulrich Henn and Claudio C.