Meteoritical Bulletin: Entry for Grosvenor Mountains 95534

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Grosvenor Mountains 95534

Basic information

Name: Grosvenor Mountains 95534
This is an OFFICIAL meteorite name.
Abbreviation: GRO 95534
Observed fall: No
Year found: 1995
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 17.9 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 19(2)	(1996)	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

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Writeup from AMN 19(2):

Sample No.:	GRO95534; GRO95535
Location:	Grosvenor Mountains
Dimensions (cm):	3.0 x 2.7 x 1.5; 3.2 x 2.5 x 2.7
Weight (g):	17.9; 53.8
Meteorite Type:	Howardite

GRO95534

GRO95535 Macroscopic Description: Cecilia E. Satterwhite

The exterior surfaces of these achondrite meteorites have smooth, shiny black fusion crust over seventy five percent of their surface. Areas where fusion crust has been plucked away reveal a gray matrix . The interior reveals a gray fine-grained texture with abundant white inclusions. A few green and black minerals are present. Minor oxidation is present.

Thin Section (GRO95534,3; 95535,5) Description: Brian Mason

The sections are so similar that a single description will suffice; the meteorites are probably paired. They show a groundmass of comminuted pyroxene (orthopyroxene and pigeonite) and plagioclase (grains up to 0.2 mm), with a few larger mineral clasts and rare polymineralic clasts up to 2.5 mm across. Microprobe analyses show a wide range in pyroxene composition: Wo_1-40, Fs_20-60, En_33-79, but with orthopyroxene clustered around Wo₈Fs₅₃to Wo₄₀Fs₂₇with fairly uniform En content. Plagioclase composition is An_86-93. An SiO₂ polymorph, probably tridymite, is present in accessory amounts. The meteorites are howardites.

Data from:
  MB82
  Table A1
  Line 168:

Origin or pseudonym:	Inner Cecily
Mass (g):	17.9
Class:	How
Weathering grade:	A/B
Ferrosilite (mol%):	20-53
Comments:	95534 pairing group

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):

References:

Published in Antarctic Meteorite Newsletter 19(2) (1996), 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

Antarctica

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

Statistics:
This is 1 of 44547 approved meteorites from Antarctica (plus 3802 unapproved names)

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