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Thiel Mountains 91722
Basic information Name: Thiel Mountains 91722
     This is an OFFICIAL meteorite name.
Abbreviation: TIL 91722
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 47.4 g
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  C2
Meteoritical Bulletin:  MB 76  (1994)  C2
NHM Catalogue:  5th Edition  (2000)  CV3
MetBase:  v. 7.1  (2006)  C2
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  CM2
Recommended:  CM2    [explanation]

This is 1 of 606 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Writeup from AMN 16(1):

Sample No.: TIL91722

Location: Thiel Mountains

Dimensions (cm): 4.0 x 2.5 x 2.5

Weight (g): 47.4 Meteorite

Type: C2 Chondrite


Macroscopic Description: Cecilia Satterwhite

Fifty percent of the exterior of TIL91722 is covered with black, frothy, and fractured fusion crust. The interior is jet black and contains abundant gray inclusions. A few areas have weathered to a yellowish-brown. The abundant evaporite deposit present has a bluish color.


Thin Section (,2) Description: Brian Mason

The section shows numerous chondrules, up to 1.1 mm across, mineral aggregates, and small mineral grains in a black carbonaceous matrix. The minerals are mainly olivine, with minor pyroxene. The composition of most olivine grains is near Mg2SiO4, but a few more iron-rich grains are present, up to Fs24. Pyroxene compositions range from Fs1 to Fs5. The meteorite is a C2 chondrite.


Data from:
  Table 2
  Line 5501:
Origin or pseudonym:Moulton Escarpment
Mass (g):47.4
Weathering grade:B/Ce
Fayalite (mol%):1-24
Ferrosilite (mol%):1-5
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References: Published in Antarctic Meteorite Newsletter 16(1) (1993), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (85° 15'S, 91° 0'W)
     Recommended::   (85° 9' 28"S, 94° 36' 27"W)
Note: the NHM and MetBase coordinates are 35.2 km apart

     This is 1 of 43331 approved meteorites from Antarctica (plus 3802 unapproved names)
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