General Information:
Chemical Formula:
NaCaMn++3(AsO4)3
Composition:
(Molecular Weight = 644.64 gm)
Sodium 3.57 % Na
Calcium 6.22 % Ca
Manganese 25.57 % Mn
Arsenic 34.87 % As
Oxygen 29.78 % O
Empirical Formula:
NaCaMn2+3(AsO4)3
Environment:
Mn-rich member of a series with caryinite.
Locality:
Sjo Mine, Grythytte Parish, Orebro, Sweden.
Name Origin:
Named from the Latin for the element As, and Greek for 'more' because it adds to the number of related minerals already described.
Physical Properties:
Cleavage:
[???] Good
Color:
cherry or reddish brown.
Density:
4.22 - 4.29, Average = 4.25
Diaphaniety:
Opaque
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., ,
Hardness:
3.5 - Copper Penny
Luster:
Greasy (Oily)
Streak:
yellowish brown
More details...