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Thiel Mountains 82407
Basic information Name: Thiel Mountains 82407
     This is an OFFICIAL meteorite name.
Abbreviation: TIL 82407
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 221 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(1)  (1984)  L4
Meteoritical Bulletin:  MB 76  (1994)  L4
NHM Catalogue:  5th Edition  (2000)  L4
MetBase:  v. 7.1  (2006)  L4
Recommended:  L4    [explanation]

This is 1 of 1707 approved meteorites (plus 4 unapproved names) classified as L4.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 7(1):

Sample No.: TIL82407

Location: Thiel Mountains

Field No.: 2771

Weight (gms): 220.8

Meteorite Type: L4 Chondrite

Physical Description: Roberta Score

TIL82407 is an angular, three flat sided, oblong shaped stone that is completely covered with brownish-black fusion crust. Abundant oxidation halos are obvious on the exterior. What fresh material is present is dark gray in color while most of the -interior has weathered to a deep reddish-brown color. Dimensions: 9.5 x 4.5 x 3 cm

 

Petrographic Description: Brian Mason

The section shows a close-packed aggregate of chondrules, up to 3 mm in diameter, with interstitial nickel-iron and troilite and fine-grained olivine and pyroxene. A variety of chondrule types is present, including granular and porphyritic olivine and olivine-pyroxene, barred olivine, and radiating pyroxene. Much of the pyroxene is polysynthetically twinned clinobronzite. Brown limonitic staining pervades the section. Microprobe analyses give the following compositions: olivine, Fa23; pyroxene somewhat variable, mean Fs20. The meteorite is an L4 chondrite.

Data from:
  MB76
  Table 2
  Line 5471:
Origin or pseudonym:Moulton Escarpment
Mass (g):220.8
Class:L4
Weathering grade:B/C
Fayalite (mol%):23
Ferrosilite (mol%):20
Comments:26Al=48±3
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(1) (1984), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (85° 15'S, 91° 0'W)
     Recommended::   (85° 9' 57"S, 94° 37' 10"W)
Note: the NHM and MetBase coordinates are 35 km apart

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