Tenacity
-
-
Solubility
-
-
Durability
-
-
Specific Gravity
3.05-3.084.76-5.03
1
7.18
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Fracture
Uneven, Irregular, Conchoidal
Conchoidal
Cleavage
None
None
Mohs Hardness
6.55.5-6.5
2
10
👆🏻
Chemical Composition
Ca 3Al 2(SiO 4) 3-x(OH) 4x (x=0.2 to 1.5)Anthony et al , Handbook of mineralogy (2001)
(Mn2+ ,Fe2+ ,Mg)(Fe3+ ,Mn3+ ) 2O 4Anthony et al , Handbook of mineralogy (2001)