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| Allan Hills A78044 | |||||||||||||||||||||||||||||
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| Basic information | Name: Allan Hills A78044 This is an OFFICIAL meteorite name. Abbreviation: ALHA78044 This meteorite may also be called Allan Hills 78044 (ALH 78044) in publications. Observed fall: No Year found: 1978 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass:  164.1 g | ||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 2012 approved meteorites (plus 4 unapproved names) classified as L4. [show all] Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||
| Writeup |
Writeup from AMN 4(2):
Sample No. : ALHA78044 Location: Allan Hills Field No.: 282 Weight (gms): 164.1 Meteorite Type: L4 Chondrite
Physical Description: Patches of brown and black fusion crust cover entire specimen except for a 2 x 2 cm area on the B surface. Many clasts are visible on the exterior surfaces. Several fractures penetrate the interior of the stone. Chipping revealed an interior that is mostly weathered. Dark gray inclusions up to 2 mm in diameter are visible in the unweathered light gray matrix. Dimensions: 6.5 x 4 x 3.5 cm.
Petrographic Description: Brian Mason The section shows a closely-packed aggregate of chondrules, 0.3-2.4 mm across; a variety of chondrule types is present, the commonest being granular and porphyritic olivine, barred olivine, and radiating and fine-grained pyroxene. The matrix consists of fine-grained olivine and pyroxene and minor subequal amounts of nickel-iron and troilite. The meteorite is considerably weathered, with limonitic staining throughout and areas of red-brown limonite associated with the metal grains. Microprobe analyses show slightly variable olivine composition (Fa23-25, average Fa14) and moderately variable pyroxene (Fs19-24, average Fs21). The meteorite is classified as an L4 chondrite. | ||||||||||||||||||||||||||||
| Data from: MB76 Table 2 Line 287: |
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| References: | Published in Antarctic Meteorite Newsletter 4(2) (1981), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:
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Statistics: This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||||||
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