1 Physical Properties
1.1 Tenacity
Not Available
Very brittle
1.2 Solubility
1.3 Durability
Not Available
Not Available
1.4 Specific Gravity
1.5 Fracture
Subconchoidal, ConchoidalAnthony et al, Handbook of mineralogy (2001), Conchoidal, Brittle
Conchoidal, Brittle, Conchoidal
1.6 Cleavage
{0001} good, {10 1 0} parting
{010} perfect, {110} distinct, {100} in traces
1.7 Mohs Hardness
1.8 Chemical Composition
(Ca,Ce)(Al,Ti,Mg)12O19
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references