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Reckling Peak A79004
Basic information Name: Reckling Peak A79004
     This is an OFFICIAL meteorite name.
Abbreviation: RKPA79004
This meteorite may also be called Reckling Peak 79004 (RKP 79004) in publications.

Observed fall: No
Year found: 1979 or 1980
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 371 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 4(1)  (1981)  H5
Meteoritical Bulletin:  MB 76  (1994)  H5
NHM Catalogue:  5th Edition  (2000)  H5
MetBase:  v. 7.1  (2006)  H5
Recommended:  H5    [explanation]

This is 1 of 10132 approved meteorites (plus 18 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeuphelp
Writeup from AMN 4(1):

Sample No.: RKPA79004

Location: Reckling Peak

Field No. : 1001, 1002, 1003, 1007, 1009, 1047

Weight (gms): 370.9

Meteorite Type: H5 Chondrite

 

Physical Description: Roberta Score

When the Reckling Peak pebbles were brought out to be initially processed, it was found that six stones appeared identical. Field Notes state that they were found close to each other. Therefore they have been renumbered as one specimen. All six stones have the same black-brown fusion crust on at least one surface. No stone was totally covered with fusion crust, but two stones have fusion crust on a fracture surface indicating the meteorite broke up in the atmosphere upon entry. The fracture surfaces have all weathered to a reddish-brown color and have a uniform pitted surface where chondrules and clasts have been plucked away. Numerous chondrules are obvious from 3 mm to <<l mm in diameter. The interiors of the pebbles are mostly weathered with some gray colored material existing.

 

Petrographic Description: Brian Mason

Three sections were examined, made from different pieces of this meteorite. No significant differences were noted, and they are described as a single sample. Chondritic structure is well defined, but the margins of the chondrules are diffuse and tend to merge with the granular groundmass, which consists largely of olivine and pyroxene, with minor amounts of nickel-iron and troilite; a little plagioclase is present, as small grains not easily discerned. Weathering is indicated by brown limonitic staining throughout the sections. Microprobe analyses give the following compositions: olivine, Fa18; pyroxene, Fs16; plagioclase, An13. The meteorite is classified as an H5 chondrite.

Data from:
  MB76
  Table 2
  Line 5382:
Mass (g):370.9
Class:H5
Weathering grade:B/C
Fayalite (mol%):18
Ferrosilite (mol%):16
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 4(1) (1981), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (76° 16'S, 159° 15'E)
     Recommended::   (76° 16'S, 159° 15'E)

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