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Grosvenor Mountains 85201
Basic information Name: Grosvenor Mountains 85201
     This is an OFFICIAL meteorite name.
Abbreviation: GRO 85201
Observed fall: No
Year found: 1985
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1401 g
Antarctic Meteorite Newsletter:  AMN 10(2)  (1987)  Iron-octahedrite
AMN 13(1)  (1990)  IIIAB
Meteoritical Bulletin:  MB 76  (1994)  IIIAB
NHM Catalogue:  5th Edition  (2000)  IIIAB
MetBase:  v. 7.1  (2006)  IIIAB
Recommended:  Iron, IIIAB    [explanation]

This is 1 of 338 approved meteorites classified as Iron, IIIAB.   [show all]
Search for other: IIIAB irons, Iron meteorites, and Metal-rich meteorites
Writeup from AMN 10(2):

Sample No.: GRO85201

Location: Grosvenor Mountains

Weight (g): 1400.7

Dimensions (cm): 13 x 8 x 3.5

Field No.: 2010

Meteorite Type: Octahedrite, probably IIIAB


Macroscopic Description: Roy S. Clarke, Jr.

The specimen is flat and roughly the shape of a slightly curved extended hand with closed fingers and thumb. The convex surface was the anterior surface during stable oriented flight. A distinct stagnation point is present at the center of this surface from which streamers of melt flowed to a circumferential lip that separates the anterior and posterior surfaces. The anterior surface is a dark reddish brown due to the presence of terrestrial oxides with patches of black fusion crust. The posterior surface is darker and has a uniform matte appearance. The specimen has been exposed to long terrestrial weathering, but its delicate ablation-produced markings are remarkably well preserved.


Polished Section Description: Roy S. Clarke, Jr.

A slice was removed from the narrow end of the specimen giving an area of 11 cm2 for examination. A regular Widmanst├Ątten pattern with band widths from 0.8 to 1.5 mm is present. Plessite areas and centers of taenite bands have a martensitic structure. Grain boundary schreibersite and occasional large rhabdites are present. Weathering has penetrated along grain boundaries into the interior. The anterior edge has a coating of intermittent terrestrial oxide generally less than 0.1 mm thick and containing remnant fusion crust in some few areas. The posterior edge is uniformly covered with a layered, lightly weathered fusion crust 1.0 to 1.5 mm thick. Interior to both edges is an α2 structure typical of a heat-altered zone. This α2 structure blends into a much coarser martensite structure that is present throughout the kamacite in the section. The meteorite is a medium octahedrite, probably a IIIAB meteorite.

Data from:
  Table 2
  Line 2850:
Mass (g):1400.7
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References: Published in Antarctic Meteorite Newsletter 10(2) (1987), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
MeteoriteCollector.org - USNM - Smithsonian   

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

     This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
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