| MetSoc Home Publications Contacts |
|
||
|
||
| Allan Hills A78105 | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Basic information | Name: Allan Hills A78105 This is an OFFICIAL meteorite name. Abbreviation: ALHA78105 This meteorite may also be called Allan Hills 78105 (ALH 78105) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  942 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 12281 approved meteorites (plus 8 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(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original. Sample No.: ALHA78105 Location: Allan Hills Field No.: 249 Weight (gms): 941.7 Meteorite Type: L6 Chondrite
Physical Description: The exterior of the sample is irregular and rough on a mm scale. The character of the exterior appears to be the result of the weathering of the fusion crust. Small patches of fusion crust remain on the B and N surfaces. Where the sample is devoid of fusion crust, light to medium gray matrix material with chondrules and lithic clasts is exposed. When the specimen was cleaved the interior of the sample appeared greenish-gray and fine grained. Only a very small amount of a metallic mineral phase is present in the sample. One fracture that penetrates the specimen is stained by iron oxidation along the margins. Dimensions: 11 x 7 x 6 cm.
Petrographic Description: Brian Mason Chondrules are sparse and ill-defined, their borders tending to merge with the granular groundmass, which consists mainly of olivine and pyroxene, with minor subequal amounts of nickel-iron and troilite, plagioclase, and accessory chromite. A moderate amount of limonitic staining is associated with some of the nickel-iron grains. Microprobe analyses show olivine (Fa23), orthopyroxene (Fs20), and plagioclase (An11) of uniform composition. The meteorite is classified as an L6 chondrite. | ||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 329: |
|
||||||||||||||||||||||||
| Catalogs: |
| ||||||||||||||||||||||||
| References: | Published in Antarctic Meteorite Newsletter 3(1) (1980), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
| ||||||||||||||||||||||||
Geography:
|
Statistics: This is 1 of 43840 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
| Proximity search: | |||||||||||||||||||||||||