Where it forms, where it's found
650recorded occurrences
Physical
- Hardness
- 1Talc
- 2Gypsum
- 3Calcite
- 4Fluorite
- 5Apatite
- 6Orthoclase
- 7Quartz
- 8Topaz
- 9Corundum
- 10Diamond
Optical
- Optical type
- Biaxial (-) · 2V measured = 70 – 110° · 2V calc = 58 – 72°
- Refractive index
- 1.7 – 1.813
- Surface relief
- High
- Principal indices
- nα 1.7 – 1.76 · nβ 1.71 – 1.8 · nγ 1.73 – 1.813
- Dispersion
- r > v moderate
Δ = 0Δmax
PPLpleochroism per grain
XPLindependent extinctions · rotate the stage
PPLpleochroism only · colour blends on rotation
XPLinterference colour · extinct every 90°
Retardation415 nm
Order1st order
XPL colour
Crystallography
- Space group
- C2/c
- Cell parameters
- a = 9.663(3) Å · b = 8.813(3) Å · c = 5.2184(16) Å
- Cell angles
- β = 106.40(2) °
- Ratio a:b:c
- 1 : 0.912 : 0.540
- Z
- 4
- Comment
Cell data from Mills & Groat (2008).
Crystal structure
Chemical composition
Synonyms
- Acmite-Augite
- Ægirin-augitt
- Aegirindiopsid
- Aegirine-augiet
- Aegirine-augit
- Aegirine-augita
- Aegirine-Diopside
- Aegirine-Hedenbergite
- Aegirite-augite
- Aegirite-diopside
- Aegirite-hedenbergite
- Aegyrinaugit
- Aegyrinaugita
- Aegyrinaugite
- Ägirinaugit
- Akmitaugit
- Alkali-Augite
- Egyrinaugit
- Egyrinaugita
- Egyrinaugite
In other languages
- German
- Aegirin-Augit
- Italian
- aegirine-augite · egirina-augite
- Portuguese
- egirina-augita
Classification
Strunz
10th ed.9.DA.20
- 9SilicatesClass
- 9.DInosilicatesDivision
- 9.DAInosilicates with 2-periodic single chains, Si2O6; pyroxene familyGroup
- 9.DA.20Aegirine-augiteSpecies
Dana
8th ed.65.01.3b.02
- 65Inosilicates Single-width, Unbranched Chains, (w=1)Class
- 65.01Single-Width Unbranched Chains, W=1 with chains P=2Type
- 65.01.3b— unnamed intermediate level —Group
- 65.01.3b.02Aegirine-augiteSpecies
CIM
—16.24.1
- 16Silicates Containing Aluminum and other MetalsClass
- 16.24Aluminosilicates of Fe, Mg, Ca and alkalisGroup
- 16.24.1Aegirine-augiteSpecies
Group, growth & confusion
Literature, links & citation
Citations
- 1892Rosenbusch, 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.
- 1892Rosenbusch, K.H.F. (1892) Mikroskopische Physiographie der petrographisch wichtigen Mineralien, Vol. 1, Schweitzerbart Stuttgart, 3. Auflage.
- 1968Papike, Joan R. Clark arid J. J. (1968) Crystal-chemical characterization of omphacites. American Mineralogist, 53 (5-6) 840-868
- 1969Tröger, W.E. (1969) Optische Bestimmung der gesteinsbildenden Minerale. Teil II. Textband (2. Auflage) [Optical determination of rock-forming minerals. Part II. (2nd edition)]. E. Schweizerbart'sche Verlagsbuchhandlung. p.1-822.
- 1972Deer, W.A., Howie, R.A., Zussman, J. (1972) Rock-forming minerals, Vol. 2. Chain Silicates, Longman London, 6.th impression.
Cite this entry
@misc{mineral2026,
author = {Mineral Index editorial board},
title = {Aegirine-augite — Mineral Index},
year = {2026},
url = {https://mineralindex.org/minerals/aegirine-augite-32},
note = {Accessed 2026-05-11}
}