Tenacity
-
-
Solubility
insoluble in water
insoluble
Durability
-
-
Specific Gravity
3.62-3.872.36
1
7.18
👆🏻
Fracture
Conchoidal
Uneven, Subconchoidal, Fibrous
Cleavage
None
[110] perfect, [101] good, [010] distinct
Mohs Hardness
7-7.53.5-4
2
10
👆🏻
Chemical Composition
Mg 3Al 2(SiO 4) 3Arthur Thomas , Gemstones (2009)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references