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Thiel Mountains 82403
Basic information Name: Thiel Mountains 82403
     This is an OFFICIAL meteorite name.
Abbreviation: TIL 82403
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 49.8 g
Antarctic Meteorite Newsletter:  AMN 6(2)  (1983)  Eucrite-br
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-br
NHM Catalogue:  5th Edition  (2000)  Eucrite-br
MetBase:  v. 7.1  (2006)  Eucrite-mmict
Recommended:  Eucrite-br    [explanation]

This is 1 of 182 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeup from AMN 6(2):

Sample No.: TILA82403

Location: Thiel Mountains

Field No.: 2776

Weight (gms): 49.8

Meteorite Type: Eucrite (brecciated)


Physical Description: Carol Schwarz

Shiny black fusion crust covers 70% of this achondrite. The exterior matrix is gray with some white clasts, and a few black and white clasts visible. The top surface contains many vugs as large as 5 mm in diameter. The interior matrix is light gray with small white and darker gray clasts. One large coarse grained black and white clast was exposed when this meteorite was chipped. Dimensions: 4.7 x 4 x 2 cm


Petrographic Description: Brian Mason

The section shows a microbreccia of angular fragments (grains up to 1.2 mm across) of pyroxene (orthopyroxene and pigeonite) and plagioclase, in a matrix of comminuted pyroxene and plagioclase. Trace amounts of troilite and nickel-iron are present as minute grains. There are numerous clasts, mostly small, but one is 6 mm long; they are ophitic intergrowths of pigeonite and plagioclase, coarse to fine-grained. Microprobe analyses show a moderate range of pyroxene compositions: Wo3-22, En30-40, Fs43-58. Plagioclase shows a considerable range of composition, An7-23.  The meteorite is a brecciated eucrite.

[Correction in AMN 7(1):] TIL 82403 - Ab 7-23

Data from:
  Table 2
  Line 5467:
Origin or pseudonym:Moulton Escarpment
Mass (g):49.8
Class:Eu "br"
Weathering grade:A
Ferrosilite (mol%):43-58
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References: Published in Antarctic Meteorite Newsletter 6(2) (1983), 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' 54"S, 94° 37' 5"W)
Note: the NHM and MetBase coordinates are 35.1 km apart

     This is 1 of 40719 approved meteorites from Antarctica (plus 4494 unapproved names)
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