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Mineralpedia Details for Aegirine

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Aegirine

Aegirine

Named for Norse-Scandinavian sea-god Aegir, as the mineral was first described from Norway where the mineral’s two co-type localities lie at Rundemyr, and Laven.  Aegirine is relatively common and widespread, and can be found in additional localities in Sweden, Spain, Russia, Greenland, Tanzania, Malawi, the United States, and Canada, among several others. It occurs commonly in alkalic igneous rocks, carbonatites, pegmatites, regionally metamorphosed schist, gneiss, iron formations, blueschist facies rocks, granulites as a result of sodium metasomatism, and as an authigenic mineral in shale and marl. Dark green acicular micro crystals in low silica igneaous rocks. Also as prismatic deep green crystals up to 5cm or more or radial groups embedded in matrix.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/aegirine.pdf

Formula
NaFe3+Si2O6 
Crystal System
Monoclinic 
Crystal Habit
Acicular 
Cleavage
Distinct, Distinct, None 
Luster
Vitreous - Resinous 
Color
green, greenish black, reddish brown, black 
Streak
yellowish gray 
Class
Monoclinic - Prismatic 
Fracture
Brittle 
Hardness
6-6.5 
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Aegirine from Bigwood Township, Sudbury, Ontario, Canada

Aegirine
            from Bigwood Township, Sudbury, Ontario, Canada

Green, long acicular crystals to 1cm in divergent patterns.

Click thumbnail images for larger view.

Aegirine from Mount Malosa, Zomba Plateau, Malawi

Aegirine
            from Mount Malosa, Zomba Plateau, Malawi

Dark green, almost black prismatic crystals to 1.2cm with white Microcline matrix.

Click thumbnail images for larger view.

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