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Reckling Peak A78004
Basic information Name: Reckling Peak A78004
     This is an OFFICIAL meteorite name.
Abbreviation: RKPA78004
This meteorite may also be called Reckling Peak 78004 (RKP 78004) in publications.

Observed fall: No
Year found: 1978
Country: Antarctica [Collected jointly by ANSMET (US) and NIPR (Japan)]
Mass:help 166.9 g
Antarctic Meteorite Newsletter:  AMN 3(1)  (1980)  H4
Meteoritical Bulletin:  MB 76  (1994)  H4
NHM Catalogue:  5th Edition  (2000)  H4
NIPR Catalogue:  2000 Edition  (2000)  H4
MetBase:  v. 7.1  (2006)  H4
Recommended:  H4    [explanation]

This is 1 of 5993 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Writeup from AMN 3(1):
This text was reprinted from AMN 3(1) in AMN 4(1). In some cases, it may be an updated version from the original.

Sample No.: RKPA78004

Location: Reckling Peak

Field No.: Reckling Peak #4

Weight (gms): 166.9

Meteorite Type: H4 Chondrite


Physical Description:

All but one surface of the sample is covered with thin, dull black fusion crust, although portions of the fusion crust on another surface appear to have been physically plucked away. The portions of the sample devoid of fusion crust are shiny reddish-brown. Chipping this small stone was impossible. Sawing revealed an interior with many clasts discernible in the dark gray matrix. Metallic fragments are present. On the cut face of the sample it appears that the inclusions in the meteorite have a more dense population around the circumference of the sample, from the exterior margin to a depth of approximately 1 cm.


Petrographic Description: Brian Mason

Chondritic structure is well developed, but many of the chondrules appear to be deformed or broken. The groundmass consists of finely granular olivine and pyroxene with minor amounts of nickel-iron and troilite (nickel-iron in excess of troilite). Well-preserved fusion crust is present along one edge of the section. Brown limonitic staining pervades the section, and veinlets and patches of limonite are present Microprobe analyses show olivine of essentially uniform composition (Fa17) and pyroxene of somewhat variable composition (Fs14-Fs21, average Fs16); some analysed spots within the pyroxene grains show up to 15% CaO, suggesting exsolution of diopsidic pyroxene. The meteorite is classified as an H4 chondrite.

Data from:
  Table 2
  Line 5377:
Mass (g):166.9
Weathering grade:A
Fayalite (mol%):17
Ferrosilite (mol%):14-21
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References: Published in Antarctic Meteorite Newsletter 3(1) (1980), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (76° 16'S, 159° 15'E)
     Recommended::   (76° 16'S, 159° 15'E)

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