Image: <bdi><a href="https://www.wikidata.org/wiki/Q108103612" class="extiw" title="d:Q108103612"><span title="Wikipedian and OpenStreetMap mapper from Cologne, Open Data activist">Raimond Spekking</span></a></bdi> (CC BY-SA 4.0)
monoclinicuncommonSilicates
Aegirine
NaFe³⁺Si₂O₆
This specimen features a cluster of dark green to black, prismatic aegirine crystals with a vitreous luster, forming a radiating or parallel aggregate.
Aegirine Physical Properties
Mohs Hardness
6Crystal System
monoclinicLuster
vitreousStreak Color
yellowish-gray to brownish-greenCleavage
Good on {110} at 87° and 93°Fracture
unevenSpecific Gravity
3.55Colors
dark green, greenish-black, black, reddish-brownTransparency
translucentType Locality
Lagendal, Larvik, NorwayMineral Group
SilicatesUses
collector, metaphysicalAssociated Minerals
nepheline, sodalite, orthoclase, albite, arfvedsonite, eudialyte, titanite, zircon, apatiteRarity
uncommonGeological Context
Aegirine is a characteristic mineral of alkaline igneous rocks, such as nepheline syenites and phonolites, forming during the late stages of magmatic crystallization in environments rich in sodium and iron.
