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Lewis Cliff 86216
Basic information Name: Lewis Cliff 86216
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 86216
Observed fall: No
Year found: 1986
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 6.5 g
Antarctic Meteorite Newsletter:  AMN 11(1)  (1988)  Ureilite
Meteoritical Bulletin:  MB 76  (1994)  Ureilite
NHM Catalogue:  5th Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 610 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Field number: 2305
Writeup from AMN 11(1):

Sample No.: LEW86216

Location: Lewis Cliff

Weight (g): 6.5

Field No.: 2305

Dimensions (cm): 1.5x1.5x1

Meteorite Type: Ureilite


Macroscopic Description: Cecilia Satterwhite

The fusion crust on this specimen is black and frothy on most surfaces. The interior is dark with light-colored inclusions up to ~3 mm.


Thin Section (,2) Description: Brian Mason

The meteorite is extremely weathered, and much of the section is obscured by brown limonite. It shows rounded olivine grains, up to 3 mm across, in a finer-grained, probably comminuted matrix of olivine with minor pyroxene. The probable presence of accessory diamond is indicated by difficulties in cutting and polishing, and by brightly fluorescent particles in an electron beam. The meteorite is heavily shocked, the large olivines being converted into a mosaic of tiny grains averaging 0.05 mm across. Microprobe analyses show olivine composition ranging Fa12-18, with a mean of Fa17 (CaO 0.2-0.4%); pyroxene compositions range Wo1-10Fs12-18. The meteorite is a ureilite.

Data from:
  Table 2
  Line 3256:
Origin or pseudonym:Lower Ice Tongue
Mass (g):6.5
Weathering grade:C
Fayalite (mol%):12-20
Ferrosilite (mol%):12-18
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References: Published in Antarctic Meteorite Newsletter 11(1) (1988), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (84° 17'S, 161° 5'E)
     Recommended::   (84° 15' 10"S, 161° 21' 15"E)
Note: the NHM and MetBase coordinates are 4.6 km apart

     This is 1 of 43699 approved meteorites from Antarctica (plus 3802 unapproved names)
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