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Allan Hills A77278 meteorite (ALHA77278), Allan Hills, Victoria Land, Eastern Antarctica, Antarcticai
Regional Level Types
Allan Hills A77278 meteorite (ALHA77278)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):
Meteorite Class:
Meteoritical Society Class:
Köppen climate type:


Unequilibrated ordinary chondrite, xenolithic (LL3.7; W1)
Find: 1977; 313 g

A small chondritic stone recovered during the 1977 Antarctic meteorite recovery efforts has a more diverse inventory of textures and minerals than other larger, more 'primitive' (less metamorphically altered) meteorites. Inspections reveal numerous and distinct chondrules — usually consisting of granular or porphyritic olivine, sometimes accompanied by twinned clinopyroxene, within a partially devitrified mesostasis. The unequilibrated olivine (Fa11-29,mean24) and Ca-poor pyroxene (Fs9-21,mean12) in chondrules, fragments, and matrix are indicative of the LL3.7 classification. Minor silicates — diopside, fassaite, forsterite, silica phases, and rare roedderite — are present in an unusually diverse ensemble of compositions and textures. As in many LL-group chondrites, Fe-Ni metal and troilite are ubiquitous but are present only in minor amounts. In spite of a terrestrial weathering age of ~300,000 years, minor oxides around the Fe-Ni metal and troilite in ALHA77278 have experienced only moderate weathering (W1) in the extremely cold and dry Antarctic environment.

The LL-group — ordinary chondrites relatively very low in total iron — constitute less than 15% of recovered meteorites. ALHA77278 itself is the 11th most massive of the small 27-member LL3.7 petrologic type subgroup. The Richfield meteorite (40.8 kg) is the most massive LL3.7 chondrite recovered as of early 2017.

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:

Augite
Formula: (CaxMgyFez)(Mgy1Fez1)Si2O6
Reference: Krot, A.N. & Rubin, A.E. (1994) Glass-rich chondrules in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 697-707. (Sept 1994).
Augite var: Fassaite
Formula: (Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Description: Euhedral grains within unusual forsterite-rich chondrule.
Reference: Krot, A.N. & Rubin, A.E. (1994) Glass-rich chondrules in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 697-707. (Sept 1994).
'Clinopyroxene Subgroup'
Reference: Meteorite Working Group (1981) Antarctic Meteorite Newsletter 4(1): Johnson Space Center: Houston.
Diopside
Formula: CaMgSi2O6
Reference: Krot, A.N. & Rubin, A.E. (1994) Glass-rich chondrules in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 697-707. (Sept 1994).; Krot, A.N. & Wasson, J.T. (1994) Silica-merrihueite/roedderite-bearing chondrules and clasts in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 707-718. (Sept 1994).
'Fayalite-Forsterite Series'
Reference: Meteorite Working Group (1981) Antarctic Meteorite Newsletter 4(1): Johnson Space Center: Houston.
Forsterite
Formula: Mg2SiO4
Reference: Krot, A.N. & Rubin, A.E. (1994) Glass-rich chondrules in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 697-707. (Sept 1994).
'Glass'
Reference: Meteorite Working Group (1981) Antarctic Meteorite Newsletter 4(1): Johnson Space Center: Houston.; Krot, A.N. & Rubin, A.E. (1994) Glass-rich chondrules in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 697-707. (Sept 1994).; Krot, A.N. & Wasson, J.T. (1994) Silica-merrihueite/roedderite-bearing chondrules and clasts in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 707-718. (Sept 1994).
Graphite
Formula: C
Reference: Scott, E.R.D, Taylor, G.J., Rubin E.A., Okada A, & Keil K. (1981) Graphite-magnetite aggregates in ordinary chondritic meteorites: Nature 291: 544-546. (June 1981).
Iron
Formula: Fe
Reference: Rubin, A. (1990) Olivine & Kamacite in Ordinary Chondrites: Intergroup and Intragroup relationships. Geochimica et Cosmochimica Acta 54(5): 1217-1230. (May 1990).
Iron var: Kamacite
Formula: (Fe,Ni)
Reference: Rubin, A. (1990) Olivine & Kamacite in Ordinary Chondrites: Intergroup and Intragroup relationships. Geochimica et Cosmochimica Acta 54(5): 1217-1230. (May 1990).
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Meteorite Working Group (1981) Antarctic Meteorite Newsletter 4(1): Johnson Space Center: Houston.
Magnetite
Formula: Fe2+Fe3+2O4
Reference: Scott, E.R.D, Taylor, G.J., Rubin E.A., Okada A, & Keil K. (1981) Graphite-magnetite aggregates in ordinary chondritic meteorites: Nature 291: 544-546. (June 1981).
'Orthopyroxene Subgroup'
Reference: Meteorite Working Group (1981) Antarctic Meteorite Newsletter 4(1): Johnson Space Center: Houston.
Roedderite
Formula: (Na,K)2(Mg,Fe)5Si12O30
Reference: Krot, A.N. & Wasson, J.T. (1994) Silica-merrihueite/roedderite-bearing chondrules and clasts in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 707-718. (Sept 1994).
'Silica'
Reference: Krot, A.N. & Wasson, J.T. (1994) Silica-merrihueite/roedderite-bearing chondrules and clasts in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 707-718. (Sept 1994).
Troilite
Formula: FeS
Reference: Krot, A.N. & Wasson, J.T. (1994) Silica-merrihueite/roedderite-bearing chondrules and clasts in ordinary chondrites: New occurrences and possible origin: Meteoritics 29(5): 707-718. (Sept 1994).

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Graphite1.CB.05aC
Iron1.AE.05Fe
var: Kamacite1.AE.05(Fe,Ni)
Group 2 - Sulphides and Sulfosalts
Troilite2.CC.10FeS
Group 4 - Oxides and Hydroxides
Magnetite4.BB.05Fe2+Fe3+2O4
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
Forsterite9.AC.05Mg2SiO4
Roedderite9.CM.05(Na,K)2(Mg,Fe)5Si12O30
Unclassified Minerals, Rocks, etc.
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Glass'-
'Limonite'-(Fe,O,OH,H2O)
'Orthopyroxene Subgroup'-
'Silica'-

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Iron
var: Kamacite
1.1.11.1(Fe,Ni)
Semi-metals and non-metals
Graphite1.3.6.2C
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Troilite2.8.9.1FeS
Group 7 - MULTIPLE OXIDES
AB2X4
Magnetite7.2.2.3Fe2+Fe3+2O4
Group 51 - NESOSILICATES Insular SiO4 Groups Only
Insular SiO4 Groups Only with all cations in octahedral [6] coordination
Forsterite51.3.1.2Mg2SiO4
Group 63 - CYCLOSILICATES Condensed Rings
Condensed Rings (Milarite - Osumilite group)
Roedderite63.2.1a.14(Na,K)2(Mg,Fe)5Si12O30
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
Unclassified Minerals, Mixtures, etc.
Augite
var: Fassaite
-(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
'Clinopyroxene Subgroup'-
'Fayalite-Forsterite Series'-
'Glass'-
Iron-Fe
'Limonite'-(Fe,O,OH,H2O)
'Orthopyroxene Subgroup'-
'Silica'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
CCarbon
C GraphiteC
OOxygen
O Limonite(Fe,O,OH,H2O)
O DiopsideCaMgSi2O6
O Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
O ForsteriteMg2SiO4
O Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
O Roedderite(Na,K)2(Mg,Fe)5Si12O30
O MagnetiteFe2+Fe23+O4
NaSodium
Na Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Na Roedderite(Na,K)2(Mg,Fe)5Si12O30
MgMagnesium
Mg DiopsideCaMgSi2O6
Mg Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Mg ForsteriteMg2SiO4
Mg Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Mg Roedderite(Na,K)2(Mg,Fe)5Si12O30
AlAluminium
Al Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
SiSilicon
Si DiopsideCaMgSi2O6
Si Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Si ForsteriteMg2SiO4
Si Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Si Roedderite(Na,K)2(Mg,Fe)5Si12O30
SSulfur
S TroiliteFeS
KPotassium
K Roedderite(Na,K)2(Mg,Fe)5Si12O30
CaCalcium
Ca DiopsideCaMgSi2O6
Ca Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Ca Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
TiTitanium
Ti Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
FeIron
Fe Iron (var: Kamacite)(Fe,Ni)
Fe IronFe
Fe Limonite(Fe,O,OH,H2O)
Fe Augite (var: Fassaite)(Ca,Na)(Mg,Fe2+,Al,Fe3+,Ti)[(Si,Al)2O6]
Fe Augite(CaxMgyFez)(Mgy1Fez1)Si2O6
Fe Roedderite(Na,K)2(Mg,Fe)5Si12O30
Fe TroiliteFeS
Fe MagnetiteFe2+Fe23+O4
NiNickel
Ni Iron (var: Kamacite)(Fe,Ni)

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Meteorite Working Group (1981) Antarctic Meteorite Newsletter 4(1): Johnson Space Center: Houston.
Scott, E.R.D, Taylor, G.J., Rubin, E.A., Okada, A., Keil, K. (1981) Graphite-magnetite aggregates in ordinary chondritic meteorites. Nature, 291, 544-546 (June 1981).
Rubin, A.E. (1990) Olivine & Kamacite in Ordinary Chondrites: Intergroup and Intragroup relationships. Geochimica et Cosmochimica Acta, 54(5), 1217-1230 (May 1990).
Wlotzka, F. (1993) A Weathering Scale for the Ordinary Chondrites. Meteoritics, 28(3), 460 (July 1993).
Grossman, J.N. (Ed.) (1994) The Meteoritical Bulletin, No. 76. Meteoritics, 29(1), 100-143 (Jan. 1994).
Krot, A.N., Rubin, A.E. (1994) Glass-rich chondrules in ordinary chondrites: New occurrences and possible origin. Meteoritics, 29(5), 697-707 (Sept 1994).
Krot, A.N., Wasson, J.T. (1994) Silica-merrihueite/roedderite-bearing chondrules and clasts in ordinary chondrites: New occurrences and possible origin. Meteoritics, 29(5), 707-718 (Sept 1994).
Grady, M.M. (2000) Catalogue of Meteorites (5/e). Cambridge University Press: Cambridge; New York; Oakleigh; Madrid; Cape Town. 689 pp.

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