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Pecora Escarpment 82520
Basic information Name: Pecora Escarpment 82520
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 82520
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 22.7 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(2)  (1984)  H3
Meteoritical Bulletin:  MB 76  (1994)  H3.6
NHM Catalogue:  5th Edition  (2000)  H3.7
MetBase:  v. 7.1  (2006)  H3.6
Recommended:  H3.6    [explanation]

This is 1 of 43 approved meteorites classified as H3.6.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Writeuphelp
Writeup from AMN 7(2):

Sample No.: PCA82520

Location: Pecora Escarpment

Field No: 2769

Weight (gms): 22.7

Meteorite Type: H3 Chondrite

 

Physical Description: Roberta Score

Overall shape of PCA82520 is pyramidal. Dull black fusion crust covers 80 of the stone while shiny reddish-brown fusion crust covers 20%. Extensive weathering has given the matrix a yellowish-to reddish-brown color. Som4 metal is still present. Dimensions: 3 x 2 x 1.5 cm

 

Petrographic Description: Brian Mason

The section shows a close-packed aggregate of chondrules (up to 1.5 mm in diameter), chondrule fragments, and a few clasts, with interstitial nickel-iron and troilite and a relatively small amount of dark matrix. A considerable variety of chondrules is present, many of granular or porphyritic olivine with transparent to turbid interstitial glass; other types include fine-grained pyroxene, medium-grained olivine and polysynthetically twinned clinopyroxene, and barred olivine. Brown limonitic staining pervades the section. Microprobe analyses show olivine mainly in the range Fa15 to Fa22, but one clast has olivine Fa6; the mean composition is Fa17 (% mean deviation of FeO is 27). Pyroxene ranges in composition from Fs2 to Fs19, with a mean of Fs14 (% mean deviation of FeO is 24). The mean composition of the olivine and the amount of nickel-iron suggest H group, and the meteorite is tentatively classified as H3.

Data from:
  MB76
  Table 2
  Line 4854:
Origin or pseudonym:Main
Mass (g):22.7
Class:H3.6
Weathering grade:B/C
Fayalite (mol%):15-22
Ferrosilite (mol%):2-19
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(2) (1984), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (85° 38'S, 68° 42'W)
     Recommended::   (85° 40' 47"S, 68° 43' 28"W)
Note: the NHM and MetBase coordinates are 5.2 km apart

Statistics:
     This is 1 of 38937 approved meteorites from Antarctica (plus 5051 unapproved names)
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