1 Physical Properties
1.1 Tenacity
1.2 Solubility
HCl soluble
Not Available
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Uneven
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
1.6 Cleavage
{10 1 1} Good
Poor on {120}, in traces on {001}
1.7 Mohs Hardness
1.13 Chemical Composition
(Ni,Mg,Fe++)CO3
TiO 2Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references