Tenacity
Brittle
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.0-3.33.1-3.2
1
7.18
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Fracture
Uneven, Conchoidal, Conchoidal to uneven
-
Cleavage
On {10 1 1} perfect; parting on {10 1 2}
Vitreous, pearly on cleavage
Mohs Hardness
3.5-43-4
2
10
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Chemical Composition
MnCO3
(Fe2+ ,Mg,Mn2+ ) 3(PO 4) 2 · 4H 2OMichael OâDonoghue , Gems, Sixth Edition (2006) More from other references