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Lewis Cliff 86010
Basic information Name: Lewis Cliff 86010
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86010
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 6.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 10(2)  (1987)  Achondrite-unique
AMN 13(1)  (1990)  Angrite
Meteoritical Bulletin:  MB 76  (1994)  Angrite
NHM Catalogue:  5th Edition  (2000)  Angrite
MetBase:  v. 7.1  (2006)  Angrite
Recommended:  Angrite    [explanation]

This is 1 of 30 approved meteorites classified as Angrite.   [show all]
Search for other: Achondrites, Angrites
Comments: Field number: 4015
Writeuphelp
Writeup from AMN 10(2):

Sample No.: LEW86010

Location: Lewis Cliff

Weight (g): 6.9

Field No.: 4015

Dimensions (cm): 1.5 x 1.5 x 1.5

Meteorite Type: Achondrite (unique)

 

Macroscopic Description: Roberta Score

Greenish-brown crystals show relief on the exterior of this polished black specimen. Flow-like features are etched in the exterior. The interior is made-up of black shiny euhedral and anhedral platy crystals, clear anhedral crystals and green platy minerals. Oxidation is present.

 

Thin Section (,5) Description: Brian Mason

The section shows a granular aggregate of subequal amounts of plagioclase, pyroxene, and olivine, with a trace of opaques; plagioclase grains are up to 2.4 mm across, whereas the pyroxene and olivine grains are somewhat smaller, 0.6-1.2 mm. The pyroxene has a reddish-purple color, and is weakly pleochroic. The olivine shows widely spaced narrow (0.01 mm) exsolution lamellae (probably of kirschsteinite, Ca(Fe,Mg)SiO4). Microprobe analyses give the following compositions: plagioclase, An100 (K2O, Na2O both less than 0.1%); olivine, Fa63, with 1.5-2.6% CaO; the pyroxene is a titanian fassaite, Wo56Fs19, with 10.4% Al2O3 and 2.4% TiO2. One grain of kirschsteinite, (Ca92Fe86Mg22)SiO4, a grain of hercynite, (Fe78Mg22)Al2O4, and a grain of merrillite were analysed. The meteorite is a unique achondrite, but the mineral compositions indicate a close relationship to Angra dos Reis.

Data from:
  MB76
  Table 2
  Line 3053:
Origin or pseudonym:Lower Ice Tongue
Mass (g):6.9
Class:Angr
Weathering grade:A/B
Fayalite (mol%):63
Ferrosilite (mol%):19
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 10(2) (1987), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   (84° 14' 9"S, 161° 32' 7"E)
Note: the NHM and MetBase coordinates are 7.3 km apart

Statistics:
     This is 1 of 38940 approved meteorites from Antarctica (plus 5051 unapproved names)
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