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Elephant Moraine 87503
Basic information Name: Elephant Moraine 87503
     This is an OFFICIAL meteorite name.
Abbreviation: EET 87503
Observed fall: No
Year found: 1987
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1735 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 11(2)  (1988)  Howardite
Meteoritical Bulletin:  MB 76  (1994)  Howardite
NHM Catalogue:  5th Edition  (2000)  Howardite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 372 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Writeuphelp
Writeup from AMN 11(2):

Sample No.: EET87503; 87509; 87510; 87512; 87513; 87518; 87531

Location: Elephant Moraine

Field No.: 2233; 2678; 2632; 2644; 4687; 2235; 3156

Weight (g): 1734.5; 583.9; 250.3; 181.6; 394.5; 349.6; 527.2

Dimensions (cm): 16.5x10x8.5; 10x6x7; 8x6x4; 7x5x4; 11x6x4.5; 7x6x5; 10x8x7

Meteorite Type: Howardite

 

Macroscopic Description: René Martinez

All of these specimens retain at least a small patch of fusion crust. EET87513 is completely covered. All have a light gray matrix hosting a variety of angular clasts: fine-grained monomineralic clasts, coarse-grained feldspathic clasts, and aphanitic black clasts ranging from sub-mm to 2 cm in size.

 

Thin Section (87503,2; 87509,11;.87510,6;.87512,8;.87513,8;.87518,7;.87531,8) Description: Brian Mason

EET87503,2 shows a groundmass of comminuted pyroxene (orthopyroxene and pigeonite) and plagioclase (grains up to 0.3 mm) with a few larger mineral grains and rare polymineralic clasts up to 2.5 mm across. Opaques are present in small amounts. Microprobe analyses show a wide range in pyroxene composition: Wo1-22, Fs20-56, En24-76, but with orthopyroxene clustered around Wo2Fs23 and pigeonite around Wo12Fs50. Plagioclase composition is An88-95. In the field 87509, 87510, 87518, and 87531 were noted as possibly paired. These, and EET87513 closely resemble EET87503,2 and the same description applies to them. EET87512,8 contains a clast, 9x3 mm, consisting of subequal amounts of plagioclase (An78-93) and pyroxene (slightly variable, average Wo7Fs33). These meteorites are howardites and are all very similar.

Data from:
  MB76
  Table 2
  Line 1677:
Origin or pseudonym:Texas Bowl
Mass (g):1734.5
Class:How
Weathering grade:A
Ferrosilite (mol%):20-56
Comments:NTL=6.1±0.8; 87503 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:   (76° 11'S, 157° 10'E)
     Recommended::   (76° 16' 29"S, 156° 29' 28"E)
Note: the NHM and MetBase coordinates are 20.7 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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