General Information:
Chemical Formula:NaFe+++Si2O6
Composition:(Molecular Weight = 231.00 gm)Sodium 9.95 %
NaIron 24.18 %
FeSilicon 24.32 %
SiOxygen 41.56 %
O Empirical Formula: NaFe3+(Si2O6)
Environment:Sodium rich igneous nepheline syenites.
IMA Status:Approved IMA 1987
Locality:TL: Norway, Buskerud, Kongsberg. Magnet Cove, Hot Spring County, Arkansas.
Name Origin:Named after the Teutonic god of the sea. Acmite is from the Greek "point" in allusion to the pointed crystals.
Physical Properties: Cleavage:[???] Distinct, [???] Distinct
Color:green, greenish black, reddish brown, or black.
Density:3.5 - 3.54, Average = 3.52
Diaphaniety:Subtransparent to translucent to opaque
Habits:Acicular - Occurs as needle-like crystals., ,
Hardness:6-6.5 - Orthoclase-Pyrite
Luminescence:Non-fluorescent.
Luster:Vitreous - Resinous
Streak:yellowish gray
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