Aegirine

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 grayMore details...