Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.1-3.52.36
1
7.18
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Fracture
Granular
Uneven, Subconchoidal, Fibrous
Cleavage
None
[110] perfect, [101] good, [010] distinct
Mohs Hardness
5-63.5-4
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe)Al 2(SiO 4)(Si 2O 7)(OH) 2 · H 2O)Arthur Thomas , Gemstones (2009)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references