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Mount Baldr A76001
Basic information Name: Mount Baldr A76001
     This is an OFFICIAL meteorite name.
Abbreviation: MBRA76001
This meteorite may also be called Mount Baldr 76001 (MBR 76001) in publications.

Observed fall: No
Year found: 1976
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 4.71 kg
Antarctic Meteorite Newsletter:  AMN 1(3)  (1978)  H6
Meteoritical Bulletin:  MB 56  (1979)  H6
MB 76  (1994)  H6
NHM Catalogue:  5th Edition  (2000)  H6
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H6
Recommended:  H6    [explanation]

This is 1 of 6500 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Revised 28 Oct 2019: Corrected mass, per JSC
Writeup from MB 56:
Warning: the following text was scanned and may contain character recognition errors. Refer to the original to be sure of accuracy.



Place of find: West of Mt. Baldr, upper Wright Valley, Victoria Land, Antarctica.

77° 35'2"S., 160° 19'35"E.

Date of find: December 15, 1976.

Class and type: Stone. Olivine-bronzite chondrite (H6).

Number of individual

specimens: 2

Total weight: 17.89 kg

Circumstances of find: Two stones were found by the U.S.-Japan Joint Expedition to Antarctica during the 1976-1977 season, on blue ice. They weighed 13.782 kg and 4.108 kg respectively and were found 700 m apart.

Source: W.A. Cassidy et al., 1977. Antarctica: a deep-freeze storehouse for meteorites. Science 198, 727-731.

Note: The smaller stone was also referred to as Mount Baldr No. 1, Mount Baldr (a), and the larger stone as Mount Baldr No. 2, Mount Baldr (b). These are synonymous, H.W. Weber and L. Schultz, 1978. Meteoritics 13, abstr.

See also: K. Yanai, 1978. First meteorites found in Victoria Land, Antarctica, December 1976 and January 1977. Mem. Nat. Inst. Polar Res., Special Issue No. 8, 51-69, and E. Olsen et al., 1978. Eleven new meteorites from Antarctica, 1976-1977. Meteoritics 13, 209-225.

[From Antarctic Meteorite Newsletter 4(1):]

Sample No.: MBRA76001

Location: Mt. Baldr

Field No.:

Weight (gms): 1096.0 -

Meteorite Type: H6 Chondrite


Physical Description:

The stone is covered with a reddish-brown fusion crust (<.5 mm) on two surfaces. Two surfaces are reddish-brown fracture surfaces, and two surfaces are cut. The fusion crust is pitted with numerous tiny holes. Several fractures penetrate the meteorite and iron oxide staining is present along some of these fractures. The matrix material is light gray. Approximate dimensions: 10.7 x 5.6 x 7.4 cm.


Petrographic Description:

This meteorite has been described in Olsen, et al., 1978, as Mt. Baldr a.

Data from:
  Table 2
  Line 4751:
Mass (g):4108
Weathering grade:B
Fayalite (mol%):18
Ferrosilite (mol%):16
Search for specimens in the Smithsonian Institution collection (U.S.):   
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References: Published in Antarctic Meteorite Newsletter 1(3) (1978), JSC, Houston
Published in Meteoritical Bulletin, no. 56, Meteoritics 14, 161-175 (1979)
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Photos from the Encyclopedia of Meteorites:
Mike Bandli   

     Catalogue of Meteorites:   (77° 35'S, 160° 34'E)
     Recommended::   (77° 35' 2"S, 160° 19' 35"E)
Note: the NHM and MetBase coordinates are 5.8 km apart

     This is 1 of 43840 approved meteorites from Antarctica (plus 3802 unapproved names)
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Synonymshelp: Mount Baldr (From MetBase)

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