General Information:
Chemical Formula:
NaFe+++(AsO4)F
Composition:
(Molecular Weight = 236.75 gm)
Sodium 9.71 % Na
Iron 23.59 % Fe
Arsenic 31.65 % As
Oxygen 27.03 % O
Fluorine 8.02 % F
Empirical Formula:
NaFe3+(AsO4)F
IMA Status:
Approved IMA
Locality:
Black Range tin district, Carton County, New Mexico, USA.
Name Origin:
Named for Charles Henry Maxwell (1923-), U. S. Geological Survey.
Physical Properties:
Cleavage:
[110] Good
Color:
dark red.
Density:
3.9
Diaphaniety:
Transparent
Habits:
Aggregates - Made of numerous individual crystals or clusters., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).,
Hardness:
5-5.5 - Apatite-Knife Blade
Luster:
Vitreous (Glassy)
Streak:
red orange
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