Tenacity
Brittle
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.21-3.382.36
1
7.18
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Fracture
Irregular/uneven, Uneven
Uneven, Subconchoidal, Fibrous
Cleavage
Perfect on {001}
[110] perfect, [101] good, [010] distinct
Mohs Hardness
6-73.5-4
2
10
👆🏻
Chemical Composition
Ca 2Al 3(SiO 4) 3(OH)Walter Schumann , Gemstones of the world (2001) More from other references
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references