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Outer Recovery Icefields 18018
Basic information Name: Outer Recovery Icefields 18018
     This is an OFFICIAL meteorite name.
Abbreviation: OUT 18018
Observed fall: No
Year found: 2019
Country: Antarctica [Collected by the Lost Meteorites of Antarctica project, UK]
Mass:help 153.4 g
Recommended:  Mesosiderite    [explanation]

This is 1 of 233 approved meteorites classified as Mesosiderite.   [show all]
Search for other: Mesosiderites, Metal-rich meteorites
Comments: Approved 31 May 2021
Writeup from MB 110:

Outer Recovery Icefields 18018 (OUT 18018)        81°28.80817’S, 17°56.95433’W

Antarctica, Antarctica

Find: 2019 Jan 11

Classification: Mesosiderite

History: The meteorite was recovered as part of the Lost Meteorites of Antarctica project, which was funded in the UK by the Leverhulme Trust and supported by the British Antarctic Survey and the University of Manchester. These samples were collected as part of the project’s first field season in austral summer December 2018 - January 2019 by a two person field party consisting of Katherine Joy and Julie Baum. Found on blue ice surface/snow at Outer Recovery Icefields ice field 3 (west icefield). Altitude 1411 m.

Physical characteristics: Mass: 153.4 g. Pieces: 1. Dimensions: 7 cm × 5 cm × 4 cm. A blocky, part stone with 85% dark gray fusion crust and dark gray exterior. Orange rust visible.

Petrography: Mineral and lithic clasts, and a network of metal grains up to 1 mm in size. Approximately 30% metal (including minor taenite), 30% pyroxene (including minor Ca-rich pyroxene), 23% plagioclase, 6% silica. Minor iron sulfide and merrillite.

Geochemistry: Mineral compositions and geochemistry: All analyses by EPMA. Low-Ca pyroxene Fs30.6±0.5Wo3.3±0.7 (N=10).

Classification: Mesosiderite. Likely paired with the two stones that comprise OUT 18014.

Specimens: 151.25 g type specimen (main mass) held at the NHM. Similarity (petrography, mineral chemistry) of this stone with the two stones of OUT 18014 suggests a likely pairing relationship.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Outer Recovery Icefields
Date:2019 Jan 11
Mass (g):153.4
Weathering grade:B
Ferrosilite (mol%):30.6±0.5 (N=10)
Wollastonite (mol%):3.3±0.7 (N=10)
Magnetic suscept.:5.22
Classifier:J. L. MacArthur, K. H. Joy and R. H. Jones, UMan
Type spec mass (g):151.25
Type spec location:NHM
Main mass:NHM
Finder:Katherine Joy
Comments:Field ID:000018 BAS ID: Z18.3.14.; submitted by J. L. MacArthur, UMan
   and collections
NHM: Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Website (institutional address; updated 9 Dec 2011)
UMan: Department of Earth Sciences, University of Manchester, Oxford Road, Manchester, M139PL, United Kingdom (institutional address)
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Public domain photographs:
Jan McArthur      

     Recommended::   (81° 28' 49"S, 17° 56' 57"W)

     This is 1 of 43352 approved meteorites from Antarctica (plus 3802 unapproved names)
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