Properties
| Category | Silicate mineral, pyroxene |
|---|---|
| Formula | NaFe3+[Si2O6] |
| Crystal system | Monoclinic |
| Color | Dark Green, Greenish Black |
| Crystal habit | Prismatic crystals may be in sprays of acicular crystals, fibrous, in radial concretions |
| Cleavage | Good on {110}, (110) ^ (110) ≈87°; parting on {100} |
| Fracture | Uneven |
| Tenacity | Brittle |
| Mohs scale hardness | 6 |
| Luster | Vitreous to slightly resinous |
| Streak | Yellowish-grey |
| Diaphaneity | Translucent to opaque |
| Specific gravity | 3.50–3.60 |
From the Wikipedia article
Aegirine is a mineral. It is a member of the clinopyroxene group of inosilicate minerals. Acmite is a fibrous green-colored variety of aegirine, with the name also used as a synonym. It was first described in 1821, in Kongsberg, Norway.
Source
Source record: crystal-compendium/aegirine/minerals.json. Fetched from English Wikipedia by the operator 2 October 2026.
https://en.wikipedia.org/wiki/Aegirine — revision id 1346103019. Text and properties from Wikipedia, licensed CC BY-SA 4.0.