1 Physical Properties
1.1 Tenacity
1.2 Solubility
Not Available
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.8 Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, Conchoidal, Conchoidal to uneven, Brittle
1.9 Cleavage
Not Available
On {10 1 1} perfect; parting on {10 1 2}
1.10 Mohs Hardness
1.12 Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001)
MnCO3