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Allan Hills A76004 meteorite (ALHA76004), Allan Hills, Victoria Land, Eastern Antarctica, Antarcticai
Regional Level Types
Allan Hills A76004 meteorite (ALHA76004)Meteorite Fall Location
Allan HillsGroup of Hills
Victoria LandRegion
Eastern AntarcticaRegion
AntarcticaContinent

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Key
Latitude & Longitude (WGS84):
76° 43' South , 159° 40' East
Latitude & Longitude (decimal):
Meteoritical Society Class:
Köppen climate type:


Unequilibrated ordinary chondrite, breccia (LL3,br; S2; W1)
Found, 1976-1977; 305 g, several pieces

Allan Hills A76004 was discovered during the austral summer of 1977-78. Although the meteorite is quite small it turned out to be one of the more petrographically and mineralogically diverse of the Antarctic meteorites recovered during the first meteorite hunting expeditions of the late 1970's. Under a somewhat weather-rounded fusion crust was a very dark gray matrix which contained a plethora of chondrules, fragments, glass, and irregular clasts — plus some diverse inclusions several cm in diameter. Chondrules [usually < 2 mm in diameter] are mainly porphyritic olivine [PO] and porphyritic olivine-pyroxene [POP], but several other types are also present. A large proportion of compound and elongated, plastically deformed chondrules are present. The range in olivine (Fa 0-34) and Ca-poor pyroxene (Fs0-53) composition is unusually large. Variable anorthic plagioclase and several varieties of silicate glass are present as well. In reflected light Fe-Ni metal and sulfides are also visible (~5 vol%). The metallic grains are often found in assemblages rimmed by troilite. Preliminary investigations revealed a number of additional phases in the chondrules, matrix, and/or inclusions (opaques, phyllosilicates, other silicates…). Shock indicators (shock level S2) include undulose extinction in olivine as well as the deformed chondrules. Weathering is relatively light (W1) with some limonite stains and small veins.

A cosmic ray exposure age of ~25 Ma is reported.

Names and abbreviations of Antarctic Meteorites: In the early 1980's a convention was fixed of using 3 letter abbreviations for Antarctic meteorites instead of the 4 letters used here. This convention did not alter the names and official abbreviations for the meteorites recognized before this time. However, one also sees — for example — 'Allan Hills 76004' and 'ALH 76004' in some of the formal scientific literature.

Regions containing this locality

Antarctic PlateTectonic Plate
Antarctic MeteoritesGroup of Meteorite Fall Locations

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


8 valid minerals.

Meteorite/Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'Albite-Anorthite Series'
Description: Variable Anorthitic Plagioclase (An65-82).
Reference: Olsen, E. et al. (1978). Eleven new meteorites from Antarctica, 1976-1977, Meteoritics 3( 2): 209-225.; Brearley, A.J. & Jones, R.H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Olsen, E. et al. (1978). Eleven new meteorites from Antarctica, 1976-1977, Meteoritics 3( 2): 209-225.
Augite var: Fassaite
Formula: (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Reference: Olsen, E. et al. (1978). Eleven new meteorites from Antarctica, 1976-1977, Meteoritics 3( 2): 209-225.
Chromite
Formula: Fe2+Cr3+2O4
Reference: Olsen, E. et al. (1978). Eleven new meteorites from Antarctica, 1976-1977, Meteoritics 3( 2): 209-225.; Brearley, A.J. & Jones, R.H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Diopside
Formula: CaMgSi2O6
Reference: Steele. I.M. (1995) Oscillatory zoning in meteoritic Forsterite: American Mineralogist 80 (7&8): 823-832. (Jul/Aug1995).
'Fayalite-Forsterite Series'
Description: Olivine composition— Fayalite 0-34 (mol%).
Reference: Graham, A.L. (1979). Meteoritical Bulletin, No. 56. Meteoritics 14 (1): 161-175. (March 1979).; Olsen, E. et al. (1978). Eleven new meteorites from Antarctica, 1976-1977, Meteoritics 3( 2): 209-225.; Graham, A.L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.; Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
Ferrosilite
Formula: FeSiO3
Description: Ferrosilite— Pyroxenes include a small component of grains with Fe#>Mg#.
Reference: Graham, A.L. (1979). Meteoritical Bulletin, No. 56. Meteoritics 14 (1): 161-175. (March 1979).
Forsterite
Formula: Mg2SiO4
Description: Forsterite, sensu strictu [Olivine, Fa0-9] includes Fa 0.2 grain w. oscillatory zoning.
Reference: Graham, A.L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.; Brearley, A.J. & Jones, R.H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA. ; Steele. I.M. (1995) Oscillatory zoning in meteoritic Forsterite: American Mineralogist 80 (7&8): 823-832. (Jul/Aug1995).
'Glass'
Description: Glass is quite variable with Si-rich, K-rich, and ultramafic varieties.
Reference: Olsen, E. et al. (1978). Eleven new meteorites from Antarctica, 1976-1977, Meteoritics 3( 2): 209-225.; Steele. I.M. (1995) Oscillatory zoning in meteoritic Forsterite: American Mineralogist 80 (7&8): 823-832. (Jul/Aug1995).
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
'Meteoritic Iron'
Reference: Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
Nepheline
Formula: Na3K(Al4Si4O16)
Reference: Olsen, E. et al. (1978). Eleven new meteorites from Antarctica, 1976-1977, Meteoritics 3( 2): 209-225.
'Pyroxene Group'
Description: Ca-poor Pyroxene : Fs (0-53) —Very small, mineralogically uncharacterized pyroxene grains include a likely clinoenstatite (sensu strictu: En>90) component.
Reference: Graham, A.L. (1979). Meteoritical Bulletin, No. 56. Meteoritics 14 (1): 161-175. (March 1979).; Graham, A.L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.; Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.
Spinel
Formula: MgAl2O4
Reference: Brearley, A.J. & Jones, R.H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Troilite
Formula: FeS
Reference: Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Chromite4.BB.05Fe2+Cr3+2O4
Spinel4.BB.05MgAl2O4
Group 9 - Silicates
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
var: Fassaite9.DA.15(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Diopside9.DA.15CaMgSi2O6
Ferrosilite9.DA.05FeSiO3
Forsterite9.AC.05Mg2SiO4
Nepheline9.FA.05Na3K(Al4Si4O16)
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Fayalite-Forsterite Series'-
'Glass'-
'Limonite'-(Fe,O,OH,H2O)
'Meteoritic Iron'-
'Pyroxene Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 7 - MULTIPLE OXIDES
AB2X4
Chromite7.2.3.3Fe2+Cr3+2O4
Spinel7.2.1.1MgAl2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Group 65 - INOSILICATES Single-Width,Unbranched Chains,(W=1)
Single-Width Unbranched Chains, W=1 with chains P=2
Augite65.1.3a.3(CaxMgyFez)(Mgy1Fez1)Si2O6
Diopside65.1.3a.1CaMgSi2O6
Ferrosilite65.1.2.2FeSiO3
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework Feldspathoids and related species
Nepheline76.2.1.2Na3K(Al4Si4O16)
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
Augite
var: Fassaite
-(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
'Fayalite-Forsterite Series'-
'Glass'-
'Limonite'-(Fe,O,OH,H2O)
'Meteoritic Iron'-
'Pyroxene Group'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
OOxygen
O FerrosiliteFeSiO3
O ChromiteFe2+Cr23+O4
O Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
O NephelineNa3K(Al4Si4O16)
O ForsteriteMg2SiO4
O SpinelMgAl2O4
O Limonite(Fe,O,OH,H2O)
O DiopsideCaMgSi2O6
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
NaSodium
Na Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Na NephelineNa3K(Al4Si4O16)
MgMagnesium
Mg Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Mg ForsteriteMg2SiO4
Mg SpinelMgAl2O4
Mg DiopsideCaMgSi2O6
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
AlAluminium
Al Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Al NephelineNa3K(Al4Si4O16)
Al SpinelMgAl2O4
SiSilicon
Si FerrosiliteFeSiO3
Si Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Si NephelineNa3K(Al4Si4O16)
Si ForsteriteMg2SiO4
Si DiopsideCaMgSi2O6
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
SSulfur
S TroiliteFeS
KPotassium
K NephelineNa3K(Al4Si4O16)
CaCalcium
Ca Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Ca DiopsideCaMgSi2O6
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
TiTitanium
Ti Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe FerrosiliteFeSiO3
Fe ChromiteFe2+Cr23+O4
Fe Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Fe Limonite(Fe,O,OH,H2O)
Fe TroiliteFeS
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Olsen, E. et al. (1978). Eleven new meteorites from Antarctica, 1976-1977: Meteoritics 3( 2): 209-225.
Meteorite Working Group (1978) Antarctic Meteorite Newsletter 1(3). Johnson Space Center, Houston. (Nov 1978).
Graham, A.L. (1979). Meteoritical Bulletin, No. 56. Meteoritics 14 (1): 161-175. (March 1979).
Graham, A.L., Bevan, A. W. R. & Hutchison, B. (1985) Catalogue of Meteorites (4/e). University of Arizona Press: Tucson.
Grossman, J.N. (1994). The Meteoritical Bulletin, No. 76: Meteoritics 29 (1): 100-143. (Jan 1994).
Graf, T. & Marti, K. (1994) Collisional records in LL-chondrites. Meteoritics 29(5): 643–648. (Sept 1994).
Steele. I.M. (1995) Oscillatory zoning in meteoritic Forsterite: American Mineralogist 80 (7&8): 823-832. (Jul/Aug1995).
Brearley, A.J. & Jones, R.H. (1998) Chondritic Meteorites. In: Planetary Materials (Papike, JJ - Ed.), Chapter 3: 1-398: Mineralogical Society of America, Washington, DC, USA.
Grady, M.M. (2000). Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pages.
Menzies, O.N., Bland, P. A., Berry, F.J. & Cressey, G. (2005) Mössbauer spectroscopy and X-ray diffraction study of ordinary chondrites: Quantification of modal mineralogy and implications for redox conditions during metamorphism. Meteoritics & Planetary Science 40 (7): 1023-1042. (July 2005).
Grady, M.M., Pratesi, G. & Moggi-Cecchi, V. (2015) Atlas of Meteorites. Cambridge University Press: Cambridge, United Kingdom. 373 pages.

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