Tenacity
-
-
Solubility
insoluble in water
insoluble
Durability
-
-
Specific Gravity
2.51-2.632.36
1
7.18
👆🏻
Fracture
Fibrous
Uneven, Subconchoidal, Fibrous
Cleavage
Perfect basal
[110] perfect, [101] good, [010] distinct
Mohs Hardness
2.5-4.53.5-4
2
10
👆🏻
Chemical Composition
Mg 3(Si 2O 5)(OH) 4Gemdat.org , Management Team (2012)
Al 3(PO 4) 2(OH,F) 3 · 5H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references