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| Elephant Moraine 87503 | |||||||||||||||||||||
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| 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:  1735 g | ||||||||||||||||||||
| Classification history: |
This is 1 of 449 approved meteorites classified as Howardite. [show all] Search for other: Achondrites, HED achondrites, and Howardites | ||||||||||||||||||||
| Writeup |
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: |
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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:
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Statistics: This is 1 of 44048 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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