Tenacity
-
Very brittle
Solubility
-
insoluble
Durability
-
-
Specific Gravity
3.1-3.23.30-3.40
1
7.18
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Fracture
-
Conchoidal
Cleavage
Vitreous, pearly on cleavage
{010} perfect, {110} distinct, {100} in traces
Mohs Hardness
3-46.5-7
2
10
👆🏻
Chemical Composition
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references
AlO(OH)Walter Schumann , Gemstones of the world (2001) More from other references