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Thiel Mountains 82408
Basic information Name: Thiel Mountains 82408
     This is an OFFICIAL meteorite name.
Abbreviation: TIL 82408
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 80.1 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(2)  (1984)  LL3
Meteoritical Bulletin:  MB 76  (1994)  LL3.1/3.5
NHM Catalogue:  5th Edition  (2000)  LL3.1/3.5
MetBase:  v. 7.1  (2006)  LL3.1-3.5
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  LL3.1-3.5
Recommended:  LL3.1-3.5    [explanation]

This is the only approved meteorite classified as LL3.1-3.5.
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 7(2):

Sample No.: TIL82408

Location: Thiel Mountains

Field No.: 2752

Weight (gms): 80.0

Meteorite Type: LL3 Chondrite

Physical Description: Roberta Score

Polygonally fractured, black fusion crust coats much of the exterior of this stone. Areas void of fusion crust are somewhat friable. This meteorite is clast-rich with very dark gray to black colored matrix. Oxidation is evenly disseminated throughout the interior surfaces. Dimensions: 4.5 x 4 x 2.5 cm

Petrographic Description: Brian Mason

The section shows a close-packed aggregate of chondrules and chondrule fragments, up to 4 mm across. The matrix is black and opaque, much of it forming rims to the chondrules; the matrix contains much sulfide and a little nickel-iron (largely weathered to limonite). A wide variety of chondrule types is present, including porphyritic and granular olivine and olivine-pyroxene, barred olivine, and fine-grained pyroxene. Many of the chondrules contain intergranular glass, sometimes clear and transparent, sometimes turbid and partly devitrified. Microprobe analyses show olivine and pyroxene, with variable compositions: olivine Fa1-Fa29, mean Fa15 (% mean deviation of FeO is 41); pyroxene, Fs2-Fs21, mean Fs9. The highly variable composition of olivine and pyroxene, and the texture, indicate type 3, and the small amount of nickel-iron suggests LL group, hence the meteorite is tentatively classified as an LL3 chondrite.

Data from:
  MB76
  Table 2
  Line 5472:
Origin or pseudonym:Moulton Escarpment
Mass (g):80.1
Class:LL3.1/3.5
Weathering grade:B
Fayalite (mol%):1-29
Ferrosilite (mol%):2-21
Comments:26Al=49±4
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(2) (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' 21"W)
Note: the NHM and MetBase coordinates are 35.1 km apart

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