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Allan Hills A77033 | |||||||||||||||||||||||||||||
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Basic information | Name: Allan Hills A77033 This is an OFFICIAL meteorite name. Abbreviation: ALHA77033 This meteorite may also be called Allan Hills 77033 (ALH 77033) in publications. Observed fall: No Year found: 1977 Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)] Mass: 9.3 g | ||||||||||||||||||||||||||||
Classification history: |
This is 1 of 98 approved meteorites classified as L3.5. [show all] Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||
Writeup |
Writeup from AMN 4(1):
Sample No.: ALHA77033 Location: Allan Hills Field No.: 77122734 Weight (gms): 9.34 Meteorite Type: L3 Chondrite
Physical Description: Specimen is angular, rough and dark brown. Exterior surfaces do not appear to have fusion crust, but are highly weathered. The stone chipped easily, revealing a highly oxidized broken face. Maximum overall length is ~3.0 cm.
Petrographic Description: Brian Mason The section shows a closely packed mass of chondrules (0.3-1.1 mm diameter) and irregular crystalline aggregates, with a little interstitial nickel-iron and troilite (1-2% of each) and a relatively small amount of fine-grained matrix. A considerable variety of chondrules is present, the commonest being granular olivine and olivine/polysynthetically-twinned clinopyroxene, porphyritic olivine, and fine-grained pyroxene. Some chondrules have intergranular transparent pale brown glass, in others the glass is turbid and partly devitrified. Yellow-brown limonitic staining pervades the section, and patches and veinlets of red-brown limonite are common. Microprobe analyses show olivine ranging in composition from Fa8 to Fa38, with a mean of Fa18; the pyroxene is relatively uniform in iron content (Fs8-9) but shows a considerable range in calcium (Wo0.3-8.5). The low content of nickel-iron and troilite suggest L group, and the meteorite is classified L3. | ||||||||||||||||||||||||||||
Data from: MB76 Table 2 Line 36: |
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References: | Published in Antarctic Meteorite Newsletter 4(1) (1981), JSC, Houston Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography: |
Statistics: This is 1 of 44400 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||||||
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Revision history: |
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