Meteoritical Bulletin: Entry for Geologists Range 99120

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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: 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 453 approved meteorites classified as Howardite. [show all]
Search for other: Achondrites, HED achondrites, and Howardites

Writeup

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

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
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 (Fs_14-58Wo_1-41) includes low- to high-FeO (Fs_14-58Wo_1-4) orthopyroxene and low-FeO augite (Fs_22-37Wo_32-41). 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:

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 24(1) (2001), JSC, Houston
Published in Meteoritical Bulletin, no. 85, MAPS 36, A293-A322 (2001)

Find references in NASA ADS:
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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

Coordinates:
Catalogue of Meteorites:	(82° 30'S, 155° 30'E)
Recommended::	(82° 30'S, 155° 30'E)

Statistics:
This is 1 of 44248 approved meteorites from Antarctica (plus 3802 unapproved names)

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