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Aegirine

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Ægir
Formula:
NaFe3+Si2O6
System:
Monoclinic
Colour:
Dark green to greenish ...
Lustre:
Vitreous
Hardness:
6
Name:
Named in 1835 by priest and mineralogist Hans Morten Thrane Esmark after Ægir (Aegir), the sea god in Norse mythology because the type location was along the sea shore. The mineral was found at Låven, Langesundsfjorden in 1834 (Berzelius 1835). Acmite (now a synonym of aegirine) was previously described in 1821 from Rundemyr, Norway.

Classification of Aegirine

Approved
8/F.01-140
9.DA.25

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
65.1.3c.2

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
14.20.2

14 : Silicates not Containing Aluminum
20 : Silicates of Fe and alkali metals
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First Recorded Occurrence of Aegirine

Year of Discovery:
1821

Occurrences of Aegirine

Geological Setting:
Common in alkalic igneous rocks, carbonatites, and pegmatites; from regionally metamorphosed schists, gneisses, and iron formations; in blueschist facies rocks, and from sodium metasomatism in granulites; authigenic in some shales and marls.

Physical Properties of Aegirine

Vitreous
Diaphaneity (Transparency):
Transparent, Opaque
Comment:
Slightly resinous
Colour:
Dark green to greenish black, reddish brown, black
Comment:
bright green to yellow-green in thin section
Streak:
Pale yellowish grey
Hardness (Mohs):
6
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {110}
Parting:
on {100}
Fracture:
Irregular/Uneven
Density:
3.5 - 3.6 g/cm3 (Measured)    3.576 g/cm3 (Calculated)

Crystallography of Aegirine

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 9.658Å, b = 8.795Å, c = 5.294Å
β = 107.42°
Ratio:
a:b:c = 1.098 : 1 : 0.602
Unit Cell Volume:
V 429.06 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Prismatic crystals, showing 110, with blunt to steep terminations, to 35 cm, striated lengthwise, can be bent or twisted. In sprays of acicular crystals, fibrous, in radial concretions.
Twinning:
Simple and lamellar on {100}
Comment:
On synthetic material.

Crystallographic forms of Aegirine

Crystal Atlas:
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Aegirine no.35 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction:
Image Loading

Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Aegirine

Type:
Biaxial (-)
RI values:
nα = 1.720 - 1.778 nβ = 1.740 - 1.819 nγ = 1.757 - 1.839
2V:
Measured: 60° to 90°, Calculated: 68° to 84°
Max Birefringence:
δ = 0.037 - 0.061
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
moderate to strong r > v
Pleochroism:
Visible
Comments:
X= emerald green, deep green
Y= grass green, deep green, yellow
Z= brownish green, green, yellowish brown, yellow
Comments:
Biaxial + for Ca,Mg,Fe varieties.

Chemical Properties of Aegirine

Formula:
NaFe3+Si2O6
Essential elements:
All elements listed in formula:
Common Impurities:
Al,Ti,V,Mn,Mg,Ca,K,Zr,Ce

Relationship of Aegirine to other Species

Other Members of Group:
Aegirine-augite(Na,Ca)(Fe3+,Fe2+,Mg,Al)Si2O6
Augite(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
ClinoenstatiteMgSiO3
ClinoferrosiliteFe2+SiO3
DiopsideCaMgSi2O6
EsseneiteCaFe3+[AlSiO6]
GrossmaniteCaTi3+ AlSiO6
HedenbergiteCaFe2+Si2O6
JadeiteNa(Al,Fe3+)Si2O6
Jervisite(Na,Ca,Fe2+)(Sc,Mg,Fe2+)Si2O6
JohannseniteCaMn2+Si2O6
KanoiteMn2+(Mg,Mn2+)Si2O6
KosmochlorNaCrSi2O6
KushiroiteCaAl[AlSiO6]
NamansiliteNaMn3+Si2O6
NatalyiteNa(V3+,Cr)Si2O6
Omphacite(Ca,Na)(Mg,Al)Si2O6
PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6
Pigeonite(Mg,Fe2+,Ca)(Mg,Fe2+)Si2O6
SpodumeneLiAlSi2O6
9.DA.05Donpeacorite(Mn2+,Mg)Mg[SiO3]2
9.DA.05EnstatiteMgSiO3
9.DA.05FerrosiliteFeSiO3
9.DA.10ClinoenstatiteMgSiO3
9.DA.10ClinoferrosiliteFe2+SiO3
9.DA.10KanoiteMn2+(Mg,Mn2+)Si2O6
9.DA.10Pigeonite(Mg,Fe2+,Ca)(Mg,Fe2+)Si2O6
9.DA.15Augite(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
9.DA.15DiopsideCaMgSi2O6
9.DA.15EsseneiteCaFe3+[AlSiO6]
9.DA.15HedenbergiteCaFe2+Si2O6
9.DA.15JohannseniteCaMn2+Si2O6
9.DA.15PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6
9.DA.15DavisiteCaScAlSiO6
9.DA.15KushiroiteCaAl[AlSiO6]
9.DA.15GrossmaniteCaTi3+ AlSiO6
9.DA.20Aegirine-augite(Na,Ca)(Fe3+,Fe2+,Mg,Al)Si2O6
9.DA.20Omphacite(Ca,Na)(Mg,Al)Si2O6
9.DA.25JadeiteNa(Al,Fe3+)Si2O6
9.DA.25Jervisite(Na,Ca,Fe2+)(Sc,Mg,Fe2+)Si2O6
9.DA.25KosmochlorNaCrSi2O6
9.DA.25NamansiliteNaMn3+Si2O6
9.DA.25NatalyiteNa(V3+,Cr)Si2O6
9.DA.30SpodumeneLiAlSi2O6
14.20.1EmeleusiteLi2Na4Fe2Si12O30
14.20.4WilkinsoniteNa2Fe42+Fe23+(Si6O18)O2
14.20.5TuperssuatsiaiteNa2Fe3Si8O20(OH)2 · 4H2O
14.20.6Riebeckite◻[Na2][Fe32+Fe23+]Si8O22(OH)2
14.20.7 Ferri-annite
14.20.8Fenaksite(K,Na)4(Fe,Mn)2(Si4O10)2(OH,F)
14.20.9Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4

Other Names for Aegirine

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Aegirine

Reference List:
Ström, P. (1821) Undersökning af ett nytt Fossil. Kongliga Vetenskaps-Academiens Handlingar, 160-163 [Acmite]

Berzelius, J. (1821) Tillägg til föregående Afhandling. Kongliga Vetenskaps-Academiens Handlingar, 163-166 [Acmite]

Berzelius, J. (1835) [Aegirin, Esmark]. Neues Jahrbuch für Mineralogie, Geognosie, Geologie und Petrefaktenkunde (von Leonard und Bonn), 1835: 184-185 [Aegirine]

Neues J. Min. (1876) 175, 352-358.

Anonymous (1947) Til opprinnelsen av mineralnavnet ”Ægirin”. Norsk Geologisk Tidsskrift, 26, 144-145

Clark, J.R., D.E. Appleman, and J.J. Papike (1969) Crystal-chemical characterization of clinopyroxenes based on eight new structure refinements. MSA Special Paper 2: 31-50.

Cameron, M., S. Shigeho, C.T. Prewitt & J.J. Papike (1973) High temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite, spodumene and ureyite. American Mineralogist: 58: 594-618.

Morimoto, N. (1988): Nomenclature of pyroxenes. American Mineralogist, 73, 1123-11333

Internet Links for Aegirine

Specimens:
The following Aegirine specimens are currently listed for sale on minfind.com.

Localities for Aegirine

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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