1 Physical Properties
1.1 Tenacity
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Conchoidal, Conchoidal, Gemstones of the world (2001)
Uneven, Brittle, Metallic
1.6 Cleavage
Not Available
Indistinct on {011}
1.7 Mohs Hardness
1.13 Chemical Composition
SiO 2 · nH 2OWalter Schumann , Gemstones of the world (2001) More from other references
CuFeS 2Anthony et al , Handbook of mineralogy (2001)