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Geologists Range 99120
Basic information Name: Geologists Range 99120
     This is an OFFICIAL meteorite name.
Abbreviation: GEO 99120
Observed fall: No
Year found: 1999
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 0.5 g
Classification
  history:
NHM Catalogue:  5th Edition  (2000)  Howardite
Antarctic Meteorite Newsletter:  AMN 24(1)  (2001)  Howardite
Meteoritical Bulletin:  MB 85  (2001)  Howardite
MetBase:  v. 7.1  (2006)  Howardite
Recommended:  Howardite    [explanation]

This is 1 of 374 approved meteorites classified as Howardite.   [show all]
Search for other: Achondrites, HED achondrites, and Howardites
Writeuphelp
Writeup from AMN 24(1):
Sample No.: GEO 99120
Location: Geologists Range
Field No.: 10733
Dimensions (cm):   0.8x0.7x0.2
Weight (g): 0.506
Meteorite Type: Howardite
    GEO99120

Macroscopic Description: Cecilia Satterwhite
The exterior is mostly brown with about 10% of black fusion crust. The interior is dark brown to black with some light colored crystalline faces in one area and some areas that are highly oxidized.

Thin Section (, 2) Description: Tim McCoy and Linda Welzenbach
GEO 99120 - Cross-Polarized Light The section consists of one portion which is an interlocking fabric of isolated pyroxene grains and basaltic clasts (up 1 mm) and a second portion dominated by a fine-grained comminuted matrix with isolated silicate grains up to 0.5 mm. Pyroxene (Fs14-58Wo1-41) includes low- to high-FeO (Fs14-58Wo1-4) orthopyroxene and low-FeO augite (Fs22-37Wo32-41). A single plagioclase grain is An91Or1. The meteorite is a howardite.

Data from:
  MB85
  Table A1
  Line 101:
Mass (g):0.5
Class:How
Weathering grade:B/Ce
Ferrosilite (mol%):14-58
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 24(1) (2001), JSC, Houston
Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)
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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:   (82° 30'S, 155° 30'E)
     Recommended::   (82° 30'S, 155° 30'E)

Statistics:
     This is 1 of 39175 approved meteorites from Antarctica (plus 5051 unapproved names)
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