Mineral description : Aegirine

Aegirine from Alnö.

Mineral class Silicates : Inosilicates : Diopside - augite group.
Chemical formula (Na,Ca)Fe(Si2O6)
Crystal system Monoclinic
Habitus Crystals as long striated crystals. Also as fibric aggregates.
Cleavage Good pyroxene cleavage, uneven fracture.
Hardness 6-6.5
Density 3.53-3.60
Color Greenish black, dark brown to red brown.
Streak Pale yellowish gray streak.
Luster Vitreous to resinous.
Occurance In igneous rocks and in metamorphic rocks. Also in nefeline syenites.
Notes Fuses easily.
Locations Unusual in Sweden.
  • Norra kärr, Gränna. As long green black crystals.
  • Hartung, Alnö area. As small needle like crystals, often fillings in cracks in migmatite.
  • Långban, Värmland. With enstatite and melanotekite.

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Last changed : 1998-03-07