Meteoritical Bulletin: Entry for Grosvenor Mountains 95581

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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: 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 451 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Writeup

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

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 Wo₂Fs₂₁to Wo₇Fs₅₄; one grain of augite, Wo₂₈Fs₂₅ was analyzed. Plagioclase composition is An_89-93. 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:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
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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:

Credit	Photos
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 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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