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Pecora Escarpment 82502
Basic information Name: Pecora Escarpment 82502
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 82502
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 890 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 6(2)  (1983)  Eucrite-unbr
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-unbr
NHM Catalogue:  5th Edition  (2000)  Eucrite-unbr
MetBase:  v. 7.1  (2006)  Eucrite
Recommended:  Eucrite-unbr    [explanation]

This is 1 of 92 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 6(2):

Sample No.: PCAA82502

Location: Pecora Escarpment

Field No.: 2713, 2770, 2788

Weight (gms): 890.4

Meteorite Type: Eucrite (unbrecciated)

 

Physical Description: Carol Schwarz

PCAA82502 consists of 3 pieces that have areas of extremely shiny fusion crust. These 3 pieces do not fit together, but it is obvious they are paired. The interiors of the fragments have a light gray matrix with darker gray inclusions up to several mm across. No weathering is evident, except that the exterior surfaces are darker gray than the interior surfaces. Dimensions: 6 x 4.5 x 2.8 cm; 4.5 x 4.3 x 3 cm; 11 x 8.5 x 8 cm

 

Petrographic Description: Brian Mason

The section shows a fine-grained ophitic intergrowth of pigeonite and plagioclase (average length of plagioclase laths is about 0.1 mm). Small areas of somewhat coarser material may be partly digested clasts of similar composition. Trace amounts of nickel-iron and troilite are present, as minute grains. Microprobe analyses show pyroxene compositions ranging fairly continuously from Wo5En34Fs61 to Wo34En30Fs36, the range in En content being quite limited.  Plagioclase composition is An8-23. The meteorite is a eucrite and is unbrecciated in thin section; it is possibly a fine-grained variant of PCAA80501 [sic].

[Correction in AMN 7(1):] PCA 82502 - Ab 8-23

Data from:
  MB76
  Table 2
  Line 4836:
Origin or pseudonym:Main
Mass (g):890.4
Class:Eu "ub"
Weathering grade:A
Ferrosilite (mol%):36-61
Comments:NTL=6±1; 82502 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 6(2) (1983), 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° 38'S, 68° 42'W)

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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