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Grosvenor Mountains 95658
Basic information Name: Grosvenor Mountains 95658
     This is an OFFICIAL meteorite name.
Abbreviation: GRO 95658
Observed fall: No
Year found: 1995
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 57.6 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 21(1)  (1998)  LL3.3
Meteoritical Bulletin:  MB 82  (1998)  LL3.3
NHM Catalogue:  5th Edition  (2000)  LL3.3
MetBase:  v. 7.1  (2006)  LL3.3
Recommended:  LL3.3    [explanation]

This is 1 of 15 approved meteorites classified as LL3.3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 21(1):

Sample No.:

GRO95658

Location:

Grosvenor Mountain

Dimensions (cm):

3.0x3.0x5.0

Weight (g):

57.62

Meteorite Type:

LL3 Chondrite (estimated LL3.3)


Macroscopic Description: Kathleen McBride
The exterior of this ordinary chondrite has dull black fusion crust over 60% of its surface. This fusion crust is striated and rough, with visible bubbles. The interior has a black matrix. Numerous, large (largest ~0.5 cm in diameter) tan and rust colored chondrules and metal grains are present.

Thin Section (,2) Description: Brian Mason
GRO95658 - Cross-Polarized LightThe section shows a close-packed aggregate of chondrules, chondrule fragments and irregular aggregates up to 1.8 mm across, in a small amount of black matrix which contains accessory nickel-iron and sulfide in minute grains. A variety of chondrules are present, including barred olivine, granular and porphyritic olivine and olivine-pyroxene, and radiating and cryptocrystalline pyroxene. Microprobe analyses show olivine and pyroxene of variable compositions; olivine, Fa6-28, mean Fa18; pyroxene, Fs2-21. The meteorite is tentatively classified as an LL3 chondrite (estimated LL3.3).

Data from:
  MB82
  Table A1
  Line 290:
Origin or pseudonym:Outer Cecily
Mass (g):57.6
Class:LL3.3
Weathering grade:A/B
Fayalite (mol%):6-28
Ferrosilite (mol%):2-21
Catalogs:
Search for specimens in the Smithsonian Institution collection (U.S.):   
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References: Published in Antarctic Meteorite Newsletter 21(1) (1998), 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 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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