Allan Hills A77307 meteorite, Allan Hills, Victoria Land, Eastern Antarctica, Antarcticai
Regional Level Types | |
---|---|
Allan Hills A77307 meteorite | Meteorite Fall Location |
Allan Hills | Group of Hills |
Victoria Land | Region |
Eastern Antarctica | Region |
Antarctica | Continent |
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Latitude & Longitude (WGS84):
76° 43' South , 159° 40' East
Latitude & Longitude (decimal):
Meteorite Class:
Meteoritical Society Class:
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 ElementsMineral 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 DiagramDetailed 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 References: |
ⓘ Corundum Formula: Al2O3 |
ⓘ Diamond Formula: C Description: Presolar component present. |
ⓘ Diopside Formula: CaMgSi2O6 Description: In amoeboid olivine aggregates (AOAs). |
ⓘ '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 References: |
ⓘ 'Glass' |
ⓘ Graphite Formula: C |
ⓘ Haxonite Formula: (Fe,Ni)23C6 Description: Very small grains inside Kamacite References: |
ⓘ Hibonite Formula: CaAl12O19 |
ⓘ Iron Formula: Fe References: |
ⓘ Iron var. Kamacite Formula: (Fe,Ni) References: |
ⓘ 'Limonite' Description: Weathering product mostly associated with nickel-iron |
ⓘ Magnetite Formula: Fe2+Fe3+2O4 References: |
ⓘ '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 References: |
ⓘ 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 References: |
ⓘ 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 References: |
ⓘ 'Silica' |
ⓘ 'Smectite Group' Formula: A0.3D2-3[T4O10]Z2 · nH2O Description: Very fine-grained serpentine and smectite interstitial to matrix olivine. |
ⓘ Spinel Formula: MgAl2O4 |
ⓘ Taenite Formula: (Fe,Ni) Description: Taenite outside chondrules is richer in Ni than taenite witin Chondrules References: |
ⓘ Tetrataenite Formula: FeNi |
ⓘ Troilite Formula: FeS |
Gallery:
List of minerals arranged by Strunz 10th Edition classification
Group 1 - Elements | |||
---|---|---|---|
ⓘ | Iron | 1.AE.05 | Fe |
ⓘ | var. Kamacite | 1.AE.05 | (Fe,Ni) |
ⓘ | Tetrataenite | 1.AE.10 | FeNi |
ⓘ | Taenite | 1.AE.10 | (Fe,Ni) |
ⓘ | Cohenite | 1.BA.05 | Fe3C |
ⓘ | Haxonite | 1.BA.10 | (Fe,Ni)23C6 |
ⓘ | Schreibersite | 1.BD.05 | (Fe,Ni)3P |
ⓘ | Graphite | 1.CB.05a | C |
ⓘ | Diamond | 1.CB.10a | C |
Group 2 - Sulphides and Sulfosalts | |||
ⓘ | Pentlandite | 2.BB.15 | (NixFey)Σ9S8 |
ⓘ | Troilite | 2.CC.10 | FeS |
ⓘ | Pyrrhotite | 2.CC.10 | Fe1-xS |
Group 4 - Oxides and Hydroxides | |||
ⓘ | Magnetite | 4.BB.05 | Fe2+Fe3+2O4 |
ⓘ | Spinel | 4.BB.05 | MgAl2O4 |
ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
ⓘ | Corundum | 4.CB.05 | Al2O3 |
ⓘ | Perovskite | 4.CC.30 | CaTiO3 |
ⓘ | Hibonite | 4.CC.45 | CaAl12O19 |
ⓘ | Rutile | 4.DB.05 | TiO2 |
ⓘ | Anatase | 4.DD.05 | TiO2 |
Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
ⓘ | Anhydrite | 7.AD.30 | CaSO4 |
Group 9 - Silicates | |||
ⓘ | Forsterite | 9.AC.05 | Mg2SiO4 |
ⓘ | Clinoenstatite | 9.DA.10 | MgSiO3 |
ⓘ | Pigeonite | 9.DA.10 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘ | Diopside | 9.DA.15 | CaMgSi2O6 |
ⓘ | Augite | 9.DA.15 | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
ⓘ | Anorthite | 9.FA.35 | Ca(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
H | Hydrogen | |
---|---|---|
H | ⓘ Smectite Group | A0.3D2-3[T4O10]Z2 · nH2O |
H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
C | Carbon | |
C | ⓘ Cohenite | Fe3C |
C | ⓘ Diamond | C |
C | ⓘ Graphite | C |
C | ⓘ Haxonite | (Fe,Ni)23C6 |
O | Oxygen | |
O | ⓘ Anatase | TiO2 |
O | ⓘ Anhydrite | CaSO4 |
O | ⓘ Anorthite | Ca(Al2Si2O8) |
O | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
O | ⓘ Chromite | Fe2+Cr23+O4 |
O | ⓘ Clinoenstatite | MgSiO3 |
O | ⓘ Corundum | Al2O3 |
O | ⓘ Diopside | CaMgSi2O6 |
O | ⓘ Forsterite | Mg2SiO4 |
O | ⓘ Hibonite | CaAl12O19 |
O | ⓘ Magnetite | Fe2+Fe23+O4 |
O | ⓘ Perovskite | CaTiO3 |
O | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
O | ⓘ Rutile | TiO2 |
O | ⓘ Spinel | MgAl2O4 |
O | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
O | ⓘ Pyroxene Group | ADSi2O6 |
O | ⓘ Smectite Group | A0.3D2-3[T4O10]Z2 · nH2O |
O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
O | ⓘ Melilite Group | Ca2M(XSiO7) |
Na | Sodium | |
Na | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Mg | Magnesium | |
Mg | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Mg | ⓘ Clinoenstatite | MgSiO3 |
Mg | ⓘ Diopside | CaMgSi2O6 |
Mg | ⓘ Forsterite | Mg2SiO4 |
Mg | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Mg | ⓘ Spinel | MgAl2O4 |
Al | Aluminium | |
Al | ⓘ Anorthite | Ca(Al2Si2O8) |
Al | ⓘ Corundum | Al2O3 |
Al | ⓘ Hibonite | CaAl12O19 |
Al | ⓘ Spinel | MgAl2O4 |
Al | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Si | Silicon | |
Si | ⓘ Anorthite | Ca(Al2Si2O8) |
Si | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Si | ⓘ Clinoenstatite | MgSiO3 |
Si | ⓘ Diopside | CaMgSi2O6 |
Si | ⓘ Forsterite | Mg2SiO4 |
Si | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Si | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Si | ⓘ Pyroxene Group | ADSi2O6 |
Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
Si | ⓘ Melilite Group | Ca2M(XSiO7) |
P | Phosphorus | |
P | ⓘ Schreibersite | (Fe,Ni)3P |
S | Sulfur | |
S | ⓘ Anhydrite | CaSO4 |
S | ⓘ Pentlandite | (NixFey)Σ9S8 |
S | ⓘ Pyrrhotite | Fe1-xS |
S | ⓘ Troilite | FeS |
Ca | Calcium | |
Ca | ⓘ Anhydrite | CaSO4 |
Ca | ⓘ Anorthite | Ca(Al2Si2O8) |
Ca | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Ca | ⓘ Diopside | CaMgSi2O6 |
Ca | ⓘ Hibonite | CaAl12O19 |
Ca | ⓘ Perovskite | CaTiO3 |
Ca | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Ca | ⓘ Plagioclase | (Na,Ca)[(Si,Al)AlSi2]O8 |
Ca | ⓘ Melilite Group | Ca2M(XSiO7) |
Ti | Titanium | |
Ti | ⓘ Anatase | TiO2 |
Ti | ⓘ Perovskite | CaTiO3 |
Ti | ⓘ Rutile | TiO2 |
Cr | Chromium | |
Cr | ⓘ Chromite | Fe2+Cr23+O4 |
Fe | Iron | |
Fe | ⓘ Augite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Fe | ⓘ Chromite | Fe2+Cr23+O4 |
Fe | ⓘ Cohenite | Fe3C |
Fe | ⓘ Haxonite | (Fe,Ni)23C6 |
Fe | ⓘ Iron | Fe |
Fe | ⓘ Iron var. Kamacite | (Fe,Ni) |
Fe | ⓘ Magnetite | Fe2+Fe23+O4 |
Fe | ⓘ Pentlandite | (NixFey)Σ9S8 |
Fe | ⓘ Pigeonite | (CaxMgyFez)(Mgy1Fez1)Si2O6 |
Fe | ⓘ Pyrrhotite | Fe1-xS |
Fe | ⓘ Schreibersite | (Fe,Ni)3P |
Fe | ⓘ Taenite | (Fe,Ni) |
Fe | ⓘ Tetrataenite | FeNi |
Fe | ⓘ Troilite | FeS |
Ni | Nickel | |
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 | ⓘ Tetrataenite | FeNi |
Other Regions, Features and Areas containing this locality
Antarctic MeteoritesGroup of Meteorite Fall Locations
Antarctic PlateTectonic Plate
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References
curator.jsc.nasa.gov (n.d.) http://curator.jsc.nasa.gov/antmet/amn/previous_newsletters/ANTARTIC_METERORITE_NEWSLETTER_VOL_1_NUMBER_3.pdf
Han, Jangmi, Brearley, Adrian J. (2011) Formation of TiO2 Nanoparticles in a CAI-Like Object from an AOA in the ALHA 77307 CO3.0 Carbonaceous Chondrite. 74th Annual Meteoritical Society Meeting.