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Reckling Peak A80256
Basic information Name: Reckling Peak A80256
     This is an OFFICIAL meteorite name.
Abbreviation: RKPA80256
This meteorite may also be called Reckling Peak 80256 (RKP 80256) in publications.

Observed fall: No
Year found: 1980
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 153.2 g
Meteoritical Bulletin:  MB 76  (1994)  L3.6/4
NHM Catalogue:  5th Edition  (2000)  L3.6/4
MetBase:  v. 7.1  (2006)  L3.6-4
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  L3.6-4
Recommended:  L3.6-4    [explanation]

This is the only approved meteorite classified as L3.6-4.
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeup from AMN 4(2):

Sample No.: RKPA80256

Location: Reckling Peak

Field No.: 1290

Weight (gms):. 153.2

Meteorite Type: L3 Chondrite


Physical Description: Roberta Score

This meteorite is almost totally covered with a brownish-black fusion crust. Areas along the edges where the fusion crust has been plucked away reveal the clastic nature of this meteorite. Chipping the sample confirmed that this meteorite is an unequilibrated chondrite with chondrules as large as .5 cm. In addition to the high concentration of chondrules, several white and gray clasts as much as .5 cm, in the longest dimension are present. Weathering is moderate. Dimensions: 7 x 5.5 x 3 cm.


Petrographic Description: Brian Mason

The thin section shows a closely packed mass of chondrules (0.3-1.8 mm diameter) and irregular crystalline aggregates. Some of the chondrules have prominent dark rims. The sparse matrix is dark and fine-grained, with a small amount of coarser nickel-iron and troilite scattered throughout. A notable variety of chondrules is present; many are granular or porphyritic olivine and olivine-pyroxene with transparent to turbid interstitial glass. The pyroxene is polysynthetically twinned clinobronzite. There is a little limonitic staining in association with metal grains. Microprobe analyses show olivine ranging in composition from Fa20 to Fa25 , with a mean of Fa22; the pyroxene is low-calcium (CaO = 0.1-0.8%), with a composition range from Fs10 to Fs26 and a mean of Fs18. This range of composition, together with presence of glass and twinned clinobronzite, indicates Type 3. The small amount of nickel-iron suggests L group. The meteorite is therefore tentatively classified as an L3 chondrite.

Data from:
  Table 2
  Line 5443:
Mass (g):153.2
Weathering grade:B
Fayalite (mol%):20-25
Ferrosilite (mol%):10-26
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References: Published in Antarctic Meteorite Newsletter 4(2) (1981), 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° 13' 5"S, 158° 48' 43"E)
Note: the NHM and MetBase coordinates are 12.8 km apart

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