1 Physical Properties
1.1 Tenacity
Not Available
Not Available
1.2 Solubility
1.3 Durability
1.4 Specific Gravity
2.7 Fracture
Uneven, Subconchoidal, UnevenArthur Thomas, Fibrous
Uneven, Conchoidal, UnevenWalter Schumann, Gemstones of the world (2001)
2.8 Cleavage
[110] perfect, [101] good, [010] distinct
Perfect {010}, imperfect {100}
2.9 Mohs Hardness
2.15 Chemical Composition
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
Ca2Al3(SiO4)3(OH)