| Mineral | AEGIRINE |
| Chemistry | NaFe 3+ [Si 2 O 6 ] |
| Color | Dark Green Greenish -black |
| Luster | Vitreous |
| CrystalSystem | Monoclinic |
| CrystalHabits | include long prismatic crystals terminated by a steep asymmetrical pyramid.Also as disseminated grains, compact and fibrous. |
| Cleavage | Distinct/Good |
| Fracture | perfect in two directions at near 90 degree angles. |
| Hardness | 6 |
| Streak | yellowish grey |
| Characteristics | Splinters or thin edges are translucent green. |
| Occurences | include Mont Saint-Hilaire, Quebec, Canada; Kongsberg, Norway; Narsarssuk, Greenland; Kola Peninsula, Russia; Magnet Cove Arkansas, USA; Kenya; Scotland and Nigeria. |
| Indicators | crystal habit (especially its steep pyramids), density, cleavage, color and hardness. |
| DensityNote | aboveaverage for translucent minerals |
| IMAStatus | Approved |
| Discovered | 1835 |
| CellParameters | a = 9.65b = 8.79c = 5.29 β=107.42° |
| Ratio | a:b:c = 1.098 : 1 : 0.602 |
| OpticalType | Biaxial (-) |
| RI | n α =1.720 - 1.778 n β =1.740 - 1.819 n |
| Birefringence | δ=0.037 - 0.061 |
| SurfaceRelief | Very High |
| Strunz | 8/F.01-140 8 : Silicates F : Inosilicates (chain and band) double chains [Si2O6]4- 01 : Pyroxene groupClinopyroxene |
