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Lewis Cliff 87001
Basic information Name: Lewis Cliff 87001
     This is an OFFICIAL meteorite name.
Abbreviation: LEW 87001
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  C2
AMN 17(1)  (1994)  CM2
Meteoritical Bulletin:  MB 76  (1994)  CM2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  CM2
Recommended:  CM2    [explanation]

This is 1 of 541 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Field number: 4403
Writeuphelp
Writeup from AMN 11(2):

Sample No.: LEW87001; LEW87003; LEW87008; LEW87022; LEW87025; LEW87027; LEW87028; LEW87167; LEW87249

Location: Lewis Cliff

Field No.: 4403; 4631; 4780; 4400; 4289; 4276; 4297; 4439; 4783

Weight (g): 4.0; 2.1; 1.4; 75.4; 0.9; 0.8; 1.2; 1.4; 3.1

Dimensions (cm): 2x1.2x1; 1.3x1x1; 1.1x1x8; 4x3.5x3.5; 1.3x1.2x0.6; 1.2x0.6x0.7; 1.4x1.2x1; 1.2x1.2x0.8; 1.5x1.3x1.2

Meteorite Type: C2 Chondrite

 

Macroscopic Description: Roberta Score and Carol Schwarz

There are spots of oxidation and small deposits of salt in the interior of most of these pebbles; otherwise the matrix is black with abundant white inclusions. Brown patches of fusion crust cover about 80% of 87022 and it has several penetrating fractures and a 1 mm weathering rind.

 

Thin Section (LEW87001,2; 87003,2; 87008,2; 87022,8; 87025,2; 87027,2; 87028,2; 87167,2; 87249,2) Description: Brian Mason

The sections of 87001, 87003, and 87249 are so similar in texture and mineral compositions to those of LEW87022 that these meteorites can confidently be paired; LEW87008, 87025, 87027, 87028, and 87167 resemble them macroscopically and have the same specific gravity, and are therefore also tentatively paired with LEW87022. LEW87022 has a dark brown to black matrix with numerous small (up to 0.3 mm) mineral grains and a few chondrules (up to 0.9 mm across). Microprobe analyses show olivine generally close to Mg2SiO4 in composition, but also a few Fe-rich grains; pyroxene is less abundant than olivine, and most grains have composition near MgSiO3. These meteorites are C2 chondrites.

Data from:
  MB76
  Table 2
  Line 3579:
Origin or pseudonym:South Lewis Cliff
Mass (g):4
Class:CM2
Weathering grade:A
Fayalite (mol%):0-28
Ferrosilite (mol%):0-6
Comments:87001 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 11(2) (1988), 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° 20' 37"S, 161° 21' 50"E)
Note: the NHM and MetBase coordinates are 7.4 km apart

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