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Grosvenor Mountains 95555
Basic information Name: Grosvenor Mountains 95555
     This is an OFFICIAL meteorite name.
Abbreviation: GRO 95555
Observed fall: No
Year found: 1995
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 251 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 19(2)  (1996)  Diogenite-unique
Meteoritical Bulletin:  MB 82  (1998)  Diogenite-unique
NHM Catalogue:  5th Edition  (2000)  Diogenite
MetBase:  v. 7.1  (2006)  Diogenite-an
Recommended:  Diogenite-an    [explanation]

This is 1 of 4 approved meteorites classified as Diogenite-an.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Writeuphelp
Writeup from AMN 19(2):
Sample No.: GRO95555
Location: Grosvenor Mountains
Dimensions (cm):   6.0 x 6.0 x 5.0
Weight (g): 250.6
Meteorite Type: Diogenite (unique)
    GRO95555

Macroscopic Description: Carol Schwarz

This specimen is angular in shape and greenish in color. There are several penetrating fractures. The exterior is somewhat polished with no fusion crust. The interior is greenish brown and crystalline with coarse-grained green and dark minerals. (It is coarser than PAT91501 (L7 Chondrite) and ALHA77005 (SNC) and contains no plagioclase.)

Thin Section (,2) Description: Brian Mason and Tim McCoy

The section shows a polygonal-granular aggregate of anhedral orthopyroxene, the grains ranging from 0.3 to 2.4 mm across. Pyroxene composition is essentially uniform, Wo2Fs24.. Accessory phases include SiO2, chromite, an iron sulfide (probably troilite), and weathering products of metal and troilite. The composition is that of a diogenite, but the texture is unique; it shows no sign of the brecciation and shock deformation characteristic of other diogenites.

Aluminum-26 Activity: Dave Lindstrom

The sample was radioassayed for Al-26 because it had not fusion crust and might have been a terrestrial rock. Estimated Al-26 activity of 50±10 dpm/hg is similar to that of diogenites and other achondrites.

Data from:
  MB82
  Table A1
  Line 189:
Origin or pseudonym:Outer Cecily
Mass (g):250.6
Class:Diog Uniq
Weathering grade:A/B
Ferrosilite (mol%):24
Catalogs:
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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:
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 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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