1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.4 Solubility
1.7 Durability
Not Available
Not Available
1.9 Specific Gravity
1.17 Fracture
Conchoidal, Uneven, ConchoidalArthur Thomas, Gemstones (2009)
Not Available
1.18 Cleavage
1.19 Mohs Hardness
1.20 Chemical Composition
(Mg,Fe2+ )Al 2O 4Gemdat.org , Management Team (2012) More from other references
Ca(Nd,Ce,La) 2(CO 3) 3F 2Ulrich Henn and Claudio C.