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Grosvenor Mountains 95581
Basic information Name: Grosvenor Mountains 95581
     This is an OFFICIAL meteorite name.
Abbreviation: GRO 95581
Observed fall: No
Year found: 1995
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 49.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 20(1)  (1997)  Howardite
Meteoritical Bulletin:  MB 82  (1998)  Howardite
NHM Catalogue:  5th Edition  (2000)  Howardite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 379 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Writeuphelp
Writeup from AMN 20(1):
Sample No.: GRO95581
Location: Grosvenor Mountains
Dimensions (cm): 4.0 x 2.0 x 2.5
Weight (g): 49.39
Meteorite Type: Howardite
GRO95581

Macroscopic Description: Kathleen McBride
Ninety percent of this achondrite's exterior surface is covered with shiny, glassy brown/black fusion crust. The interior is light gray with clasts up to 3 cm in diameter. Plagioclase and pyroxene grains are numerous. Minor amount of weathering is visible.

Thin Section (,4 & ,6) Description: Brian Mason
The sections show a groundmass of comminuted pyroxene (orthopyroxene and pigeonite) and plagioclase (grains up to 0.3 mm) with a few larger plagioclase clasts (up to 3 mm). Microprobe analyses show a wide composition range in low -calcium pyroxene, from Wo2Fs21 to Wo7Fs54; one grain of augite, Wo28Fs25 was analyzed. Plagioclase composition is An89-93. The meteorite is a howardite; it is very similar to GRO95534, and 95535, with which it is probably paired.

Data from:
  MB82
  Table A1
  Line 215:
Origin or pseudonym:Inner Cecily
Mass (g):49.4
Class:How
Weathering grade:A
Ferrosilite (mol%):21-54
Comments:95534 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 20(1) (1997), JSC, Houston
Published in Meteoritical Bulletin, no. 82, MAPS 33, A221-A240 (1998)
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Photos:
CreditPhotos
Photographs from AMN:
Photograph from unknown source A photo is in the write-up above
Photos from the Encyclopedia of Meteorites:
courtesy Dr Carlton Allen, JSC-KT, NASA   
Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (85° 40'S, 175° 0'E)
     Recommended::   (85° 40'S, 175° 0'E)

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