![]() |
||
|
Allan Hills A78131 | |||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic information | Name: Allan Hills A78131 This is an OFFICIAL meteorite name. Abbreviation: ALHA78131 This meteorite may also be called Allan Hills 78131 (ALH 78131) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: ![]() | ||||||||||||||||||||||||
Classification history: |
This is 1 of 12222 approved meteorites (plus 7 unapproved names) classified as L6. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||
Writeup![]() |
Writeup from AMN 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA78131 Location: Allan Hills Field No.: 404 Weight (gms): 268.8 Meteorite Type: L6 Chondrite
Physical Description: A thin, shiny black fusion crust covers the specimen, with the exceptions of most of T surface and portions of the N and B surfaces. Shallow regmaglypts are present on the S, W, and T surfaces. The surfaces that are devoid of fusion crust are weathered and stained by iron-oxidation and range texturally from smooth to rough on a centimeter scale. Several light colored clasts are present on the surfaces devoid of fusion crust. No fractures are present en the sample. When the meteorite was cleaved during processing, only a small amount of unweathered material was exposed.
Petrographic Description: Brian Mason Chondrules are sparse and poorly defined, their borders tending to merge with the granular groundmass, which consists largely of olivine and pyroxene with minor subequal amounts of nickel-iron and troilite, plagioclase, and accessory chromite. A moderate amount of brown limonitic staining is present around the nickel-iron grains. Microprobe analyses give the following compositions: olivine, Fa25; pyroxene, Fs21; plagioclase, An10. The meteorite is an L6 chondrite. ALHA78130, 78131 are L6 chondrites similar in all respects to ALHA78126. | ||||||||||||||||||||||||
Data from: MB76 Table 2 Line 354: |
|
||||||||||||||||||||||||
Catalogs: |
| ||||||||||||||||||||||||
References: | Published in Antarctic Meteorite Newsletter 3(2) (1980), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
| ||||||||||||||||||||||||
Geography:![]() |
Statistics: This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
Proximity search: |