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Aegirine

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Aegirine
Aegirine is a member of the clinopyroxene group of inosilicates. Aegirine is the sodium endmember of the aegirine-augite series. Aegirine has the chemical formula NaFeSi2O6 in which the iron is present as Fe3+. In the aegirine-augite series the sodium is variably replaced by calcium with iron(II) and magnesium replacing the iron(III) to balance the charge. Aluminium also substitutes for the iron(III). It is also known as acmite, which is a fibrous, green-colored variety.

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Mineralogy Database Dictionary

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Aegirine

General Information:
 Chemical Formula:
NaFe+++Si2O6
 Composition:
(Molecular Weight = 231.00 gm)
Sodium 9.95 % Na
Iron 24.18 % Fe
Silicon 24.32 % Si
Oxygen 41.56 % 
 Empirical Formula:
NaFe3+(Si2O6)
 Environment:
Sodium rich igneous nepheline syenites.
 IMA Status:
Approved IMA 1987
 Locality:
TL: Norway, Buskerud, Kongsberg. Magnet Cove, Hot Spring County, Arkansas.
 Name Origin:
Named after the Teutonic god of the sea. Acmite is from the Greek "point" in allusion to the pointed crystals.
Physical Properties:
 Cleavage:
[???] Distinct, [???] Distinct
 Color:
green, greenish black, reddish brown, or black.
 Density:
3.5 - 3.54, Average = 3.52
 Diaphaniety:
Subtransparent to translucent to opaque
 Habits:
Acicular - Occurs as needle-like crystals., ,
 Hardness:
6-6.5 - Orthoclase-Pyrite
 Luminescence:
Non-fluorescent.
 Luster:
Vitreous - Resinous
 Streak:
yellowish gray
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Dizionario inglese-italiano 1.0.012

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AEGIRINE
EGIRINA

Glosarium Pusat Bahasa Depdiknas Indonesia

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aegirine
B: (Kimia) aegirina

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