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Aegirine-augite

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Big Photo

In den Dellen quarries, Niedermendig, Mendig, Laach lake volcanic complex, Eifel, Rhineland-Palatinate, Germany
© C.H.M.-Schäfer

Show Aegirine-augite Photos (20)



Formula:
(Na,Ca)(Fe
3+
 
,Fe
2+
 
,Mg,Al)Si
 
2
O
 
6
System:MonoclinicHardness:6
Name:Name applied to a member of the Aegirine-Augite series with a chemical composition intermediate between the two species.




Pyroxene Group.

Classification of Aegirine-augite

IMA status:Redefined Approved 1988
Strunz 9th edition ID:9.DA.20
Nickel-Strunz 10th (pending) edition ID:9.DA.20

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

65 : INOSILICATES Single-Width,Unbranched Chains,(W=1)
1 : Single-Width Unbranched Chains, W=1 with chains P=2
Hey's CIM Ref.:16.24.1

16 : Silicates Containing Aluminum and other Metals
24 : Aluminosilicates of Fe, Mg, Ca and alkalis
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Physical Properties of Aegirine-augite

Hardness (Mohs):6

Crystallography of Aegirine-augite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/b {B1 1 2/b} {C2/c} {C1 2/c 1}
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).

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°
Maximum Birefringence:δ = 0.030 - 0.053

Chart 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

Formula:
(Na,Ca)(Fe
3+
 
,Fe
2+
 
,Mg,Al)Si
 
2
O
 
6
Essential elements:Fe, Na, O, Si
All elements listed in formula:Al, Ca, Fe, Mg, Na, O, Si

Relationship of Aegirine-augite to other Species

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.20Omphacite
(Ca,Na)(Mg,Al)Si
 
2
O
 
6
9.DA.25Aegirine
NaFe
3+
 
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:

- +
16.24.2Omphacite
(Ca,Na)(Mg,Al)Si
 
2
O
 
6
16.24.4Ferri-katophorite
Na(CaNa)(Mg
 
4
Fe
3+
 
)(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.5Ferro-ferri-katophorite
NaCaNaFe
2+
4
(Fe
3+
 
)[(AlSi
 
7
)O
 
22
](OH)
 
2
16.24.6Barroisite
☐{CaNa}{Mg
 
3
Al
 
2
}(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.7Ferri-barroisite
☐(CaNa)(Mg
 
3
Fe
3+
2
)(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.8Alumino-ferrobarroisite
☐{CaNa}{Fe
2+
3
Al
 
2
}(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.9Ferro-barroisite
☐{CaNa}{Fe
2+
3
Al
 
2
}(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.10Ferro-ferri-barroisite
☐(CaNa)(Fe
2+
3
Fe
3+
2
)(AlSi
 
7
O
 
22
)(OH)
 
2
16.24.11Hastingsite
{Na}{Ca
 
2
}{Fe
2+
4
Fe
3+
 
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.24.12Magnesio-hastingsite
{Na}{Ca
 
2
}{Mg
 
4
Fe
3+
 
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.24.13Taramite Group
A(CaNa)(Z
2+
3
Z
3+
2
)(Al
 
2
Si
 
6
O
 
22
)((OH),F,Cl)
 
2
16.24.14Ferri-taramite
Na(CaNa)(Mg
 
3
Fe
3+
2
)(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.24.15Magnesiotaramite
{Na}{CaNa}{Mg
 
3
AlFe
3+
 
}(Al
 
2
Si
 
6
O
 
22
)(OH)
 
2
16.24.16Osumilite-(Mg)
KMg
 
2
Al
 
3
(Al
 
2
Si
 
10
)O
 
30
16.24.16Osumilite
(K,Na)(Fe
2+
 
,Mg)
 
2
(Al,Fe
3+
 
)
 
3
(Si,Al)
 
12
O
 
30

Other Names for Aegirine-augite

Synonyms:
Acmite-AugiteAegirine-DiopsideAegirine-HedenbergiteAegirite-augiteAegirite-diopside
Aegirite-hedenbergiteAegyrinaugiteAlkali-AugiteEgyrinaugite
Other Languages:
German:Aegirin-Augit
Aegyrinaugit
Ägirinaugit
Akmitaugit
Egyrinaugit
Simplified Chinese:霓辉石
Spanish:Aegirine-augita
Aegyrinaugita
Egyrinaugita
Varieties:
BlanforditeGrünblendePorricin

Other Information

Health Warning:Rosenbusch, H. (1892): Mikroskopische Physiographie der petrographisch wichtigen Mineralien, Vol. 1, Schweitzerbart Stuttgart, 3. Auflage

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. (1988): Nomenclature of Pyroxenes. Am. Mineral. 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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    • Localities for Aegirine-augite

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    Locality Updated: Trübenbach, Gaming, Mostviertel, Lower Austria, AustriaFrom Harald Schillhammer, 23rd May 2013 08:47:24