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Aegirine-augite

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Formula:
(Ca,Na)(Fe3+,Mg,Fe2+)Si2O6
System:
Monoclinic
Hardness:
6
Name:
Named informally in 1892 by Karl Harry Ferdinand Rosenbusch for a mineral chemically between Aegirine and Augite. Aegirine-augite was mostly treated as a variety until Joan R. Clark and James J. Papike (1968) redefined aegirine-augite from a neotype location, although the validation of aegirine-augite did not materially alter the original description except to restrict the crystal structure. In 1988, Nobuo Morimoto, J. Fabries, A. K. Ferguson, I. V. Ginzburg, Malcolm Ross, F. A. Seifert, J. Zussman, K. Aoki, and G. Gottardi indicated that aegirine-augite was "retained" and published a diagram restricting the name to compositions ranging from Ae80Wo20 to Ae20Wo80.


Classification of Aegirine-augite

Approved
Notes:
Redefined by the IMA
Approval History:
Redefined by IMA: 1988 (special procedure).
9.DA.20

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

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
16.24.1

16 : Silicates Containing Aluminum and other Metals
24 : Aluminosilicates of Fe, Mg, Ca and alkalis

Physical Properties of Aegirine-augite

Hardness (Mohs):
6

Optical Data of Aegirine-augite

Type:
Biaxial (-)
RI values:
nα = 1.700 - 1.760 nβ = 1.710 - 1.800 nγ = 1.730 - 1.813
2V:
Measured: 70° to 110°, Calculated: 58° to 72°
Max Birefringence:
δ = 0.030 - 0.053
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v moderate

Chemical Properties of Aegirine-augite

IMA Formula:
(Ca,Na)(Fe3+,Mg,Fe2+)Si2O6
Elements listed in formula:

Crystallography of Aegirine-augite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Cell Parameters:
a = 9.663(3) Å, b = 8.813(3) Å, c = 5.2184(16) Å
β = 106.40(2)°
Ratio:
a:b:c = 1.096 : 1 : 0.592
Unit Cell Volume:
V 426.32 ų (Calculated from Unit Cell)
Z:
4
Comment:
Cell data from Mills & Groat (2008).

Occurrences of Aegirine-augite

Paragenetic Mode(s):

Relationship of Aegirine-augite to other Species

Other Members of Group:
AegirineNaFe3+Si2O6
Augite(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
ClinoenstatiteMgSiO3
ClinoferrosiliteFe2+SiO3
DiopsideCaMgSi2O6
EsseneiteCaFe3+[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
NatalyiteNaV3+Si2O6
Omphacite(Ca,Na)(Mg,Al)Si2O6
PetedunniteCa(Zn,Mn2+,Mg,Fe2+)Si2O6
Pigeonite(Mg,Fe2+,Ca)(Mg,Fe2+)Si2O6
SpodumeneLiAlSi2O6
9.DA.05DonpeacoriteMn2+Mg(SiO3)2
9.DA.05EnstatiteMgSiO3
9.DA.05FerrosiliteFe22+Si2O6
9.DA.10ClinoenstatiteMgSiO3
9.DA.10ClinoferrosiliteFe2+SiO3
9.DA.10KanoiteMn2+MgSi2O6
9.DA.10Pigeonite(Mg,Fe,Ca)SiO3
9.DA.15Augite(Ca,Mg,Fe)2Si2O6
9.DA.15DiopsideCaMgSi2O6
9.DA.15EsseneiteCaFe3+AlSiO6
9.DA.15HedenbergiteCaFe2+Si2O6
9.DA.15JohannseniteCaMn2+Si2O6
9.DA.15PetedunniteCaZnSi2O6
9.DA.15DavisiteCaScAlSiO6
9.DA.15KushiroiteCaAl(AlSi)O6
9.DA.15GrossmaniteCaTi3+AlSiO6
9.DA.20Omphacite(Ca,Na)(Mg,Fe,Al)Si2O6
9.DA.25AegirineNaFe3+Si2O6
9.DA.25JadeiteNaAlSi2O6
9.DA.25JervisiteNaScSi2O6
9.DA.25KosmochlorNaCrSi2O6
9.DA.25NamansiliteNaMn3+Si2O6
9.DA.25NatalyiteNaV3+Si2O6
9.DA.30SpodumeneLiAlSi2O6
16.24.2Omphacite(Ca,Na)(Mg,Fe,Al)Si2O6
16.24.4Ferri-katophoriteNa(NaCa)(Mg4Fe3+)(Si7Al)O22(OH)2
16.24.5Ferro-ferri-katophoriteNa(NaCa)(Fe42+Fe3+)(Si7Al)O22(OH)2
16.24.6Barroisite◻NaCa[Mg3Al2](Si7Al)O22(OH)2
16.24.7Ferri-barroisite☐(CaNa)(Mg3Fe23+)(AlSi7O22)(OH)2
16.24.8Alumino-ferrobarroisite☐{CaNa}{Fe32+Al2}(AlSi7O22)(OH)2
16.24.9Ferro-barroisite☐{CaNa}{Fe32+Al2}(AlSi7O22)(OH)2
16.24.10Ferro-ferri-barroisite☐(CaNa)(Fe32+Fe23+)(AlSi7O22)(OH)2
16.24.11HastingsiteNaCa2(Fe42+Fe3+)(Si6Al2)O22(OH)2
16.24.12Magnesio-hastingsiteNaCa2(Mg4Fe3+)Si6Al2O22(OH)2
16.24.13Taramite Root NameA(CaNa)(Z32+Z23+)(Al2Si6O22)(OH,F,Cl)2
16.24.14Ferri-taramiteNa(CaNa)(Mg3Fe23+)(Al2Si6O22)(OH)2
16.24.15Magnesiotaramite{Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2
16.24.16Osumilite-(Mg)KMg2(Al5Si10)O30
16.24.16OsumiliteKFe22+(Al5Si10)O30

Other Names for Aegirine-augite

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.

Aegirine-augite in petrology

An essential component of (items highlighted in red)
Common component of (items highlighted in red)

References for Aegirine-augite

Reference List:
Rosenbusch, K.H.F. (1892) Mineralien des monoklinen Krystallsystems. Gruppe der monoklinen Pyroxene. in Mikroskopische Physiographie der Petrographisch Wichtigen Mineralien, E.Schweizerbart'sche Verlagshandlung (E. Koch), Stuttgart: 510-539.

Rosenbusch, K.H.F. (1892) Mikroskopische Physiographie der petrographisch wichtigen Mineralien, Vol. 1, Schweitzerbart Stuttgart, 3. Auflage.

Clark, J.R., Papike, J.J. (1968) Crystal-Chemical Characterization of Omphacites. American Mineralogist: 53: 840-868.

Tröger, W.E. (1969) Optische Bestimmung der gesteinsbildenden Minerale, Vol. 2, Schweitzerbart Stuttgart, 2. Auflage.

Deer, W.A., Howie, R.A., Zussman, J. (1972) Rock-forming minerals, Vol. 2. Chain Silicates, Longman London, 6.th impression.

Morimoto, N., Fabries, J., Ferguson, A.K., Ginzburg, I.V., Ross, M., Seifert, F.A., Zussman, J., Aoki, K., Gottardi, G. (1988) Nomenclature of Pyroxenes. American Mineralogist: 73: 1123-1133.

Birch, W.D., Wood, A., White, A.J.R., Mills, S.J., Freeman, R. (2008) Aegirine–augite crystals in scoria from Mount Shadwell and Mount Anakie, Victoria, Australia. Australian Journal of Mineralogy: 14(1): 37–42.

Mills, S.J., Groat, L. A. (2008) The crystal structure of yellow aegirine–augite from Mount Anakie, Victoria. Australian Journal of Mineralogy: 14(1): 43–45.

Internet Links for Aegirine-augite

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