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Allan Hills A77307 meteorite, Allan Hills, Victoria Land, Eastern Antarctica, Antarcticai
Regional Level Types
Allan Hills A77307 meteoriteMeteorite Fall Location
Allan HillsGroup of Hills
Victoria LandRegion
Eastern AntarcticaRegion
AntarcticaContinent

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Latitude & Longitude (WGS84):
76° 43' South , 159° 40' East
Latitude & Longitude (decimal):
Köppen climate type:
Mindat Locality ID:
247192
Long-form identifier:
mindat:1:2:247192:4
GUID (UUID V4):
0628c183-481f-4dad-9e3a-252e8894e11d
Other/historical names associated with this locality:
ALHA77307; ALH 77307


Carbonaceous Chondrite, Ornans-like (CO3.0; S1)
1977 Find, 181.3 g

Allan Hills A77307 (ALHA77307), classified as a CO3.0 (Ornans-like) Carbonaceous Chondrite, is a small and somewhat weathered stone largely covered by a black fusion crust. ALHA77307 is one of only 7 known members of the very primitive type CO3.0 Chondrites as of early Jul7 2015. The meteorite consists mostly of small chondrules rich in forsteritic olivine and enstatite-rich pyroxenes. Small amounts of metal (kamacite, taenite tetrataenite) are present but limonite stains and some magnetite grains give clear indications of significant weathering of some portions of the meteorite. The matrix which accounts for nearly 50% of the meteorite is extremely fine-grained and is genetically related to the chondrule population. However, within the matrix are various exotic components which include unusually early hibonite and corundum (believed to be among the very earliest condensates of the ancient solar nebula) as well as a large number of very tiny presolar diamond, graphite, silicates, oxides, and silicon carbide grains. The presolar phases are usually revealed by their isotopic anomalies and are, unfortunately, only partially characterized mineralogically.

Most other CO3.0 chondrites are larger than ALHA77307, but ALHA77307 was apparently the first to be recognized as a CO3.0 and has consequently received quite a bit of attention for such a modest-sized stone.

Nota Bene: ALHA77307 may be referred to as 'Allan Hills 77307' or 'ALH 77307'. These usages reflect simpler conventions adopted after the meteorite had been formally named.

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


26 valid minerals.

Meteorite/Rock Types Recorded

Note: 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:

Anatase
Formula: TiO2
Description: In a CAI-like Object
Anhydrite
Formula: CaSO4
Description: In fibrous veins
Anorthite
Formula: Ca(Al2Si2O8)
Description: In amoeboid olivine aggregate (AOA).
Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
'Chlorite Group'
Description: Principal alteration product in chondrules.
Chromite
Formula: Fe2+Cr3+2O4
Clinoenstatite
Formula: MgSiO3
'Clinopyroxene Subgroup'
Description: Usually polysynthetically-twinned; mostly enstatite-rich (Fs~1), but range is Fs1 — Fs12.
Cohenite
Formula: Fe3C
Corundum
Formula: Al2O3
Diamond
Formula: C
Description: Presolar component present.
Diopside
Formula: CaMgSi2O6
Description: In amoeboid olivine aggregates (AOAs).
References:
'Fayalite-Forsterite Series'
Description: Mostly forsteritic (Fa~1), but excursions noted by Mason (1978); even larges excursion with an isolated zoned Olivine grain varing from Fo99-Fo60 noted by Nagahara & Kushiro (1982a)
References:
Forsterite
Formula: Mg2SiO4
'Glass'
Graphite
Formula: C
Haxonite
Formula: (Fe,Ni)23C6
Description: Very small grains inside Kamacite
Hibonite
Formula: CaAl12O19
Iron
Formula: Fe
Iron var. Kamacite
Formula: (Fe,Ni)
'Limonite'
Description: Weathering product mostly associated with nickel-iron
Magnetite
Formula: Fe2+Fe3+2O4
'Melilite Group'
Formula: Ca2M(XSiO7)
Description: In Amoeboid olivine aggregate (AOA)
'Nickel-iron'
'Orthopyroxene Subgroup'
Description: Orthopyroxene — Orthopyroxene frequently twinned, composition roughly (En90).
Pentlandite
Formula: (NixFey)Σ9S8
Description: Replacing troilite in some chondrules
Perovskite
Formula: CaTiO3
Description: In Amoeboid olivine aggregate (AOA)
Pigeonite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Description: Composition (Fo~4Wo~8).
'Plagioclase'
Formula: (Na,Ca)[(Si,Al)AlSi2]O8
Description: An 69
'Plessite'
'Pyroxene Group'
Formula: ADSi2O6
Pyrrhotite
Formula: Fe1-xS
Rutile
Formula: TiO2
Schreibersite
Formula: (Fe,Ni)3P
Description: In amoeboid olivine aggregate (AOA).
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4
'Silica'
'Smectite Group'
Formula: A0.3D2-3[T4O10]Z2 · nH2O
Description: Very fine-grained serpentine and smectite interstitial to matrix olivine.
Spinel
Formula: MgAl2O4
References:
Taenite
Formula: (Fe,Ni)
Description: Taenite outside chondrules is richer in Ni than taenite witin Chondrules
Tetrataenite
Formula: FeNi
Troilite
Formula: FeS

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Iron1.AE.05Fe
var. Kamacite1.AE.05(Fe,Ni)
Tetrataenite1.AE.10FeNi
Taenite1.AE.10(Fe,Ni)
Cohenite1.BA.05Fe3C
Haxonite1.BA.10(Fe,Ni)23C6
Schreibersite1.BD.05(Fe,Ni)3P
Graphite1.CB.05aC
Diamond1.CB.10aC
Group 2 - Sulphides and Sulfosalts
Pentlandite2.BB.15(NixFey)Σ9S8
Troilite2.CC.10FeS
Pyrrhotite2.CC.10Fe1-xS
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
Spinel4.BB.05MgAl2O4
Chromite4.BB.05Fe2+Cr3+2O4
Corundum4.CB.05Al2O3
Perovskite4.CC.30CaTiO3
Hibonite4.CC.45CaAl12O19
Rutile4.DB.05TiO2
Anatase4.DD.05TiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Anhydrite7.AD.30CaSO4
Group 9 - Silicates
Forsterite9.AC.05Mg2SiO4
Clinoenstatite9.DA.10MgSiO3
Pigeonite9.DA.10(CaxMgyFez)(Mgy1Fez1)Si2O6
Diopside9.DA.15CaMgSi2O6
Augite9.DA.15(CaxMgyFez)(Mgy1Fez1)Si2O6
Anorthite9.FA.35Ca(Al2Si2O8)
Unclassified
'Plessite'-
'Glass'-
'Nickel-iron'-
'Serpentine Subgroup'-D3[Si2O5](OH)4
'Smectite Group'-A0.3D2-3[T4O10]Z2 · nH2O
'Orthopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Silica'-
'Pyroxene Group'-ADSi2O6
'Plagioclase'-(Na,Ca)[(Si,Al)AlSi2]O8
'Clinopyroxene Subgroup'-
'Chlorite Group'-
'Limonite'-
'Melilite Group'-Ca2M(XSiO7)

List of minerals for each chemical element

HHydrogen
H Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
H Serpentine SubgroupD3[Si2O5](OH)4
CCarbon
C CoheniteFe3C
C DiamondC
C GraphiteC
C Haxonite(Fe,Ni)23C6
OOxygen
O AnataseTiO2
O AnhydriteCaSO4
O AnorthiteCa(Al2Si2O8)
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O ChromiteFe2+Cr23+O4
O ClinoenstatiteMgSiO3
O CorundumAl2O3
O DiopsideCaMgSi2O6
O ForsteriteMg2SiO4
O HiboniteCaAl12O19
O MagnetiteFe2+Fe23+O4
O PerovskiteCaTiO3
O Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
O RutileTiO2
O SpinelMgAl2O4
O Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
O Pyroxene GroupADSi2O6
O Smectite GroupA0.3D2-3[T4O10]Z2 · nH2O
O Serpentine SubgroupD3[Si2O5](OH)4
O Melilite GroupCa2M(XSiO7)
NaSodium
Na Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
MgMagnesium
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg ClinoenstatiteMgSiO3
Mg DiopsideCaMgSi2O6
Mg ForsteriteMg2SiO4
Mg Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg SpinelMgAl2O4
AlAluminium
Al AnorthiteCa(Al2Si2O8)
Al CorundumAl2O3
Al HiboniteCaAl12O19
Al SpinelMgAl2O4
Al Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
SiSilicon
Si AnorthiteCa(Al2Si2O8)
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si ClinoenstatiteMgSiO3
Si DiopsideCaMgSi2O6
Si ForsteriteMg2SiO4
Si Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Si Pyroxene GroupADSi2O6
Si Serpentine SubgroupD3[Si2O5](OH)4
Si Melilite GroupCa2M(XSiO7)
PPhosphorus
P Schreibersite(Fe,Ni)3P
SSulfur
S AnhydriteCaSO4
S Pentlandite(NixFey)Σ9S8
S PyrrhotiteFe1-xS
S TroiliteFeS
CaCalcium
Ca AnhydriteCaSO4
Ca AnorthiteCa(Al2Si2O8)
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca DiopsideCaMgSi2O6
Ca HiboniteCaAl12O19
Ca PerovskiteCaTiO3
Ca Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Ca Plagioclase(Na,Ca)[(Si,Al)AlSi2]O8
Ca Melilite GroupCa2M(XSiO7)
TiTitanium
Ti AnataseTiO2
Ti PerovskiteCaTiO3
Ti RutileTiO2
CrChromium
Cr ChromiteFe2+Cr23+O4
FeIron
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe ChromiteFe2+Cr23+O4
Fe CoheniteFe3C
Fe Haxonite(Fe,Ni)23C6
Fe IronFe
Fe Iron var. Kamacite(Fe,Ni)
Fe MagnetiteFe2+Fe23+O4
Fe Pentlandite(NixFey)Σ9S8
Fe Pigeonite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe PyrrhotiteFe1-xS
Fe Schreibersite(Fe,Ni)3P
Fe Taenite(Fe,Ni)
Fe TetrataeniteFeNi
Fe TroiliteFeS
NiNickel
Ni Haxonite(Fe,Ni)23C6
Ni Iron var. Kamacite(Fe,Ni)
Ni Pentlandite(NixFey)Σ9S8
Ni Schreibersite(Fe,Ni)3P
Ni Taenite(Fe,Ni)
Ni TetrataeniteFeNi

Other Regions, Features and Areas containing this locality

Antarctic MeteoritesGroup of Meteorite Fall Locations
Antarctic PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

 
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