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| Allan Hills A81258 | |||||||||||||||||||||
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| Basic information | Name: Allan Hills A81258 This is an OFFICIAL meteorite name. Abbreviation: ALHA81258 This meteorite may also be called Allan Hills 81258 (ALH 81258) in publications. Observed fall: No Year found: 1981 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass:  1.1 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 565 approved meteorites (plus 1 unapproved name) classified as CV3. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CV chondrites, and CV-CK clan chondrites | ||||||||||||||||||||
| Writeup |
Writeup from AMN 8(1):
Sample No.: ALHA81258 Location: Allan Hills Weight (g): 1.1 Field No.: 1651 Dimensions (cm): 1 x 1 x 0.5 Meteorite Type: C3V Chondrite
Macroscopic Description: Roberta Score The stone is mostly covered with a vesicular black fusion crust.
Thin-Section (,1) Description: Brian Mason The section shows numerous chondrules up to 2 mm across and irregular crystalline aggregates, up to 3 mm in maximum dimension, set in a minor amount of dark brown to black, semi-opaque matrix. The chondrules and aggregates consist mainly of granular olivine with minor amounts of polysynthetically twinned pyroxene. Trace amounts of nickel-iron are present as minute grains. Sulfide is present in small amounts, finely dispersed throughout the matrix and sometimes concentrated in chondrule rims. Microprobe analyses of chondrule olivine show a wide compositional range: Fa0-28, mean Fa11. The matrix appears to consist largely of fine-grained iron-rich olivine, Fa40-60. Pyroxene in the chondrules is clinoenstatite, mostly near Fs1, but with occasional Fe-rich grains. The meteorite is a C3V chondrite, very similar to ALHA81003; the possibility of pairing should be considered. | ||||||||||||||||||||
| Data from: MB76 Table 2 Line 780: |
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| References: | Published in Antarctic Meteorite Newsletter 8(1) (1985), 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 40849 approved meteorites from Antarctica (plus 4494 unapproved names) | ||||||||||||||||||||
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