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Bates Nunataks A78001
Basic information Name: Bates Nunataks A78001
     This is an OFFICIAL meteorite name.
Abbreviation: BTNA78001
This meteorite may also be called Bates Nunataks 78001 (BTN 78001) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 160.7 g
Antarctic Meteorite Newsletter:  AMN 3(2)  (1980)  L6
Meteoritical Bulletin:  MB 76  (1994)  L6
NHM Catalogue:  5th Edition  (2000)  L6
NIPR Catalogue:  2000 Edition  (2000)  L6
MetBase:  v. 7.1  (2006)  L6
Recommended:  L6    [explanation]

This is 1 of 12080 approved meteorites (plus 6 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 3(2):
This text was reprinted from AMN 3(2) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: BTNA78001

Location: Bates Nunatak

Field No.: 328

Weight (gms): 160.7

Meteorite Type: L6 Chondrite


Physical Description:

The sample (10 x 6 x 1 cm.) is flat and has black fusion crust on all surfaces, with the exception of the B and portions of the W surfaces. The sample has been fractured into two pieces across its middle. The B surface is polished and has a mottled yellowish-red-brown appearance. Chipping of the specimens revealed a medium gray matrix with inclusions (<1 mm.). The sample has a prominent (1 mm) weathering rind.


Petrographic Description: Brian Mason

Chondritic structure is barely discernible, the sparse chondrules merging with the granular groundmass, which consists largely of olivine and pyroxene, with minor subequal amounts of nickel-iron and troilite, maskelynite, and accessory chromite. The section shows some dark veinlets, up to 0.6 mm thick, which consist of a very fine-grained aggregate of opaque material and transparent isotropic material; the latter may be majorite and ringwoodite. Brown limonitic staining pervades the section. Microprobe analyses show olivine (Fa24) and orthopyroxene (Fs21) of uniform composition; the maskelynite has CaO (2.0%) appropriate to oligoclase composition, but has deficient and variable Na2O content (4.3-7.0%). The meteorite is classified as an L6 chondrite.

Data from:
  Table 2
  Line 1413:
Mass (g):160.7
Weathering grade:B
Fayalite (mol%):24
Ferrosilite (mol%):21
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References: Published in Antarctic Meteorite Newsletter 3(2) (1980), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (80° 15'S, 153° 30'E)
     Recommended::   (80° 15'S, 153° 30'E)

     This is 1 of 43352 approved meteorites from Antarctica (plus 3802 unapproved names)
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