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Aegirine crystal - click for larger pic
Aegirine Crystal
© Doug Merson

Aegirine crystals - click for larger pic
Aegirine crystals
© Stephan Wolfsried

Aegirine crystals - click for larger pic
Aegirine crystals on aegirine
© Quintin Wight

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Home > Mineral Descriptions > Aegirine - (3 Photos)



Aegirine
NaFe3+Si2O6

     Aegirine, a member of the pyroxene group, is one of the most abundant and conspicuous crystallized minerals occurring at MSH. It is a major constituent in the pegmatites and occurs in varying degrees of abundance in most of the other mineral associations.

     The crystals range in size from tiny, acicular, millimeter-size crystals often formed in radiating aggregates to superb, large, prismatic crystals up to 30cm in length. The crystals are typically well terminated.

PHYSICAL CHARACTERISTICS:

Color varies from pale to dark green (most common), yellow, brown,
   and red for the acicular habits. The larger crystals are invariably black.
Luster is vitreous.
Diaphaneity is transparent to opaque in the larger crystals.
Crystal System is monoclinic; C2/c.
Crystal Habits the tetragonal dipyramid, equant and the tabular
   habit with dominant pinacoid.
Cleavage: {110} distinct and {010} imperfect.
Fracture is conchoidal.
Hardness is 5 - 6.
Specific Gravity is approximately 3.3 g/cm3.
Streak is white.
Associated Minerals include almost all minerals.
Distinguishing Features: larger crystals exhibit large well terminated
   crystals, while acicular habit presents pale colours.
Origin: Named in 1835 for Aegir, the Scandinavian god of the sea.

CLASSIFICATION:

Dana System
# 65.1.3c.2

Strunz Classification
# VIII/F.1-140

REFERENCES:
MinRec 21:294 (1990), Dana 8:1305-1306 (1997)

DISTRIBUTION AND RARITY AT MONT SAINT-HILAIRE:

MSH
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PE
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AP
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MX
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SS
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MC
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HF
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BR
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SX
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FR
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