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Aegirine

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Formula:
NaFe
3+
 
Si
 
2
O
 
6
System:MonoclinicColour:Dark green to greenish ...
Lustre:VitreousHardness:6
Member of:Clinopyroxene Subgroup > Pyroxene Group
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.


Pyroxene Group. Clinopyroxene Subgroup.

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Classification of Aegirine

IMA status:Approved
Strunz 8th edition ID:8/F.01-140
Strunz 9th edition ID:9.DA.25
Nickel-Strunz 10th (pending) edition ID:9.DA.25

9 : SILICATES (Germanates)
D : Inosilicates
A : Inosilicates with 2-periodic single chains, Si2O6; pyroxene family
Dana 8th edition ID:65.1.3c.2

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:14.20.2

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

Co-type Localities:Rundemyr, Øvre Eiker, Buskerud, Norway
Låven (Skådön; Lamö; Lamanskjaer), Langesundsfjorden, Larvik, Vestfold, Norway
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

Lustre: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 (measured):3.5 - 3.6 g/cm3
Density (calculated):3.576 g/cm3

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.
Crystal Atlas:
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Aegirine no.35 - Goldschmidt (1913-1926)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
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°
Maximum Birefringence:δ = 0.037 - 0.061

Chart 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:
NaFe
3+
 
Si
 
2
O
 
6
Simplified for copy/paste:NaFe3+Si2O6
Essential elements:Fe, Na, O, Si
All elements listed in formula:Fe, Na, O, Si
Common Impurities:Al,Ti,V,Mn,Mg,Ca,K,Zr,Ce

Relationship of Aegirine to other Species

Member of:Clinopyroxene Subgroup > Pyroxene Group
Other Members of Group:

- +
Aegirine-augite
(Na,Ca)(Fe
3+
 
,Fe
2+
 
,Mg,Al)Si
 
2
O
 
6
Augite
(Ca,Na)(Mg,Fe
2+
 
,Al,Fe
3+
 
,Ti)[(Si,Al)
 
2
O
 
6
]
Clinoenstatite
MgSiO
 
3
Clinoferrosilite
Fe
2+
 
SiO
 
3
Diopside
CaMgSi
 
2
O
 
6
Esseneite
CaFe
3+
 
[AlSiO
 
6
]
Grossmanite
CaTi
3+
 
AlSiO
 
6
Hedenbergite
CaFe
2+
 
Si
 
2
O
 
6
Jadeite
Na(Al,Fe
3+
 
)Si
 
2
O
 
6
Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)Si
 
2
O
 
6
Johannsenite
CaMn
2+
 
Si
 
2
O
 
6
Kanoite
Mn
2+
 
(Mg,Mn
2+
 
)Si
 
2
O
 
6
Kosmochlor
NaCrSi
 
2
O
 
6
Kushiroite
CaAl[AlSiO
 
6
]
Namansilite
NaMn
3+
 
Si
 
2
O
 
6
Natalyite
Na(V
3+
 
,Cr)Si
 
2
O
 
6
Omphacite
(Ca,Na)(Mg,Al)Si
 
2
O
 
6
Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)Si
 
2
O
 
6
Pigeonite
(Mg,Fe
2+
 
,Ca)(Mg,Fe
2+
 
)Si
 
2
O
 
6
Spodumene
LiAlSi
 
2
O
 
6
Common Associates:
SéranditeRiebeckiteNephelineK FeldsparEudialyte
CatapleiiteAstrophylliteArfvedsoniteApophylliteAenigmatite
Related Minerals - Nickel-Strunz Grouping):

- +
9.DA.05Donpeacorite
(Mn
2+
 
,Mg)Mg[SiO
 
3
]
 
2
9.DA.05Enstatite
MgSiO
 
3
9.DA.05Ferrosilite
FeSiO
 
3
9.DA.10Clinoenstatite
MgSiO
 
3
9.DA.10Clinoferrosilite
Fe
2+
 
SiO
 
3
9.DA.10Kanoite
Mn
2+
 
(Mg,Mn
2+
 
)Si
 
2
O
 
6
9.DA.10Pigeonite
(Mg,Fe
2+
 
,Ca)(Mg,Fe
2+
 
)Si
 
2
O
 
6
9.DA.15Augite
(Ca,Na)(Mg,Fe
2+
 
,Al,Fe
3+
 
,Ti)[(Si,Al)
 
2
O
 
6
]
9.DA.15Diopside
CaMgSi
 
2
O
 
6
9.DA.15Esseneite
CaFe
3+
 
[AlSiO
 
6
]
9.DA.15Hedenbergite
CaFe
2+
 
Si
 
2
O
 
6
9.DA.15Johannsenite
CaMn
2+
 
Si
 
2
O
 
6
9.DA.15Petedunnite
Ca(Zn,Mn
2+
 
,Mg,Fe
2+
 
)Si
 
2
O
 
6
9.DA.15Davisite
CaScAlSiO
 
6
9.DA.15Kushiroite
CaAl[AlSiO
 
6
]
9.DA.15Grossmanite
CaTi
3+
 
AlSiO
 
6
9.DA.20Aegirine-augite
(Na,Ca)(Fe
3+
 
,Fe
2+
 
,Mg,Al)Si
 
2
O
 
6
9.DA.20Omphacite
(Ca,Na)(Mg,Al)Si
 
2
O
 
6
9.DA.25Jadeite
Na(Al,Fe
3+
 
)Si
 
2
O
 
6
9.DA.25Jervisite
(Na,Ca,Fe
2+
 
)(Sc,Mg,Fe
2+
 
)Si
 
2
O
 
6
9.DA.25Kosmochlor
NaCrSi
 
2
O
 
6
9.DA.25Namansilite
NaMn
3+
 
Si
 
2
O
 
6
9.DA.25Natalyite
Na(V
3+
 
,Cr)Si
 
2
O
 
6
9.DA.30Spodumene
LiAlSi
 
2
O
 
6
Related Minerals - Hey's Index Grouping:

- +
14.20.1Emeleusite
Li
 
2
Na
 
4
Fe
 
2
Si
 
12
O
 
30
14.20.4Wilkinsonite
Na
 
2
Fe
2+
4
Fe
3+
2
(Si
 
6
O
 
18
)O
 
2
14.20.5Tuperssuatsiaite
Na
 
2
Fe
 
3
Si
 
8
O
 
20
(OH)
 
2
· 4H
 
2
O
14.20.6Riebeckite
◻[Na
 
2
][Fe
2+
3
Fe
3+
2
]Si
 
8
O
 
22
(OH)
 
2
14.20.7 Ferri-annite
14.20.8Fenaksite
(K,Na)
 
4
(Fe,Mn)
 
2
(Si
 
4
O
 
10
)
 
2
(OH,F)
14.20.9Montdorite
(K,Na)
 
2
(Fe
2+
 
,Mn
2+
 
,Mg)
 
5
(Si
 
4
O
 
10
)
 
2
(OH,F)
 
4

Other Names for Aegirine

Synonyms:
AcmiteAcniteAegerineAegeriteAegirite
AegyrinaAegyrineAegyriteAemiteAgirine
Jadeite-AegirineNatronägirinSoda-Aegirite
Other Languages:
Croatian:Aegirin
Dutch:Aegirien
Estonian:Ägiriin
Finnish:Akmiitti
German:Aegirin
Achmit
Acmit
Acnit
Aegerit
Aegirit
Aegyrit
Aemit
Agerit
Ägirin
Aigirin
Akmit
Hebrew:אגירין
Italian:Egirina
Japanese:エジリン輝石
錐輝石
Norwegian (Bokmål):Ægirin
Polish:Egiryn
Portuguese:Egirina
Russian:Эгирин
Simplified Chinese:霓石
Spanish:Egirina
Acmita
Acnita
Aegerita
Aegirita
Aegyrita
Aemita
Ukrainian:Егірин-авгіт
Varieties:
Titanoan AegirineVanadian Aegirine

Other Information

Health Warning: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

Best Localities for Aegirine

Best of Species:Aegirine

Internet Links for Aegirine

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Aegirine details from Handbook of Mineralogy (PDF)
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    Localities for Aegirine

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