Physical Properties
Tenacity
Brittle
Brittle
Solubility
Effervesces in hot HCl
Not Available
Durability
Not Available
Not Available
Specific Gravity
2.92-3.12
3.7-3.8
Fracture
Conchoidal, ConchoidalArthur Thomas, Gemstones (2009), Brittle
Subconchoidal, ConchoidalArthur Thomas, Gemstones (2009), Conchoidal, Brittle
Cleavage
[10 1 1] perfect
Distinct on {010}
Mohs Hardness
3.5-4.5
7-7.5
Chemical Composition
MgCO 3Michael OâDonoghue , Gems, Sixth Edition (2006) More from other references
(Fe,Mg,Zn) 2Al 9(Si,Al) 4O 22(OH) 2Ulrich Henn and Claudio C.
