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Lewis Cliff 87064
Basic information Name: Lewis Cliff 87064
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 87064
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 6.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 15(1)  (1992)  H3
Meteoritical Bulletin:  MB 76  (1994)  H3.5
NHM Catalogue:  5th Edition  (2000)  H3.5
MetBase:  v. 7.1  (2006)  H3
Recommended:  H3.5    [explanation]

This is 1 of 20 approved meteorites classified as H3.5.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Field number: 4148
Writeuphelp
Writeup from AMN 15(1):

Sample No.: LEW87064

Location: Lewis Cliff

Field Number: 4148

Dimensions (cm): 2 x 1.5 x 1.5

Weight (g): 6.7

Meteorite Type: H3 chondrite

 

Macroscopic Description: Carol Schwarz

LEW87064 is a rounded stone with a smooth surface. Ninety five percent of the exterior is covered with fusion crust. Although the interior is extensively weathered, several millimeter-sized chondrules are visible.

 

Thin Section (,2) Description: Brian Mason

The section shows a close-packed aggregate of chondrules and chondrule fragments, up to 1.8 mm across, in a granular matrix containing a moderate amount of nickel-iron and troilite. A variety of chondrule types is present, including granular and porphyritic olivine and olivine-pyroxene, and radiating and cryptocrystalline pyroxene. Weathering is extensive, with limonitic staining and areas of red-brown limonite throughout the section. Microprobe analyses show olivine and pyroxene of variable composition: olivine, Fa2-20, mean Fa14 (CV FeO is 43); pyroxene, Fs3-21. The amount of nickel-iron suggests H group, and the variability of olivine and pyroxene compositions type 3, hence the meteorite is classified as an H3 chondrite (estimated H3.5).

 

Data from:
  MB76
  Table 2
  Line 3641:
Origin or pseudonym:Lower Ice Tongue
Mass (g):6.7
Class:H3.5
Weathering grade:B/C
Fayalite (mol%):2-20
Ferrosilite (mol%):3-21
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 15(1) (1992), 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° 15' 13"S, 161° 23' 24"E)
Note: the NHM and MetBase coordinates are 4.8 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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