1 Physical Properties
2.2 Tenacity
2.4 Solubility
Not Available
Not Available
2.7 Durability
Not Available
Not Available
2.10 Specific Gravity
3.05-3.082.78-2.88
1
7.18
2.17 Fracture
Subconchoidal, Uneven, Conchoidal, Uneven
Micaceous, Brittle
2.18 Cleavage
Poor on {100}
Perfect on the {001}
2.19 Mohs Hardness
2.20 Chemical Composition
Mn2+ Al(PO 4)(OH) 2H 2OMichael OâDonoghue , Gems, Sixth Edition (2006)
KAl 2AlSi 3O 10(OH) 2Walter Schumann , Gemstones of the world (2001) More from other references