Tenacity
-
-
Solubility
-
insoluble
Durability
-
-
Specific Gravity
2.90-3.102.36
1
7.18
👆🏻
Fracture
Splintery, Granular
Uneven, Subconchoidal, Fibrous
Cleavage
None
[110] perfect, [101] good, [010] distinct
Mohs Hardness
6-6.53.5-4
2
10
👆🏻
Chemical Composition
Ca 2(Mg,Fe) 5(OH) 2Walter 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