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Pecora Escarpment 82501
Basic information Name: Pecora Escarpment 82501
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 82501
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 54.4 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-mmict
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.: PCAA82501

Location: Pecora Escarpment

Field No.: 2725

Weight (gms): 54.4

Meteorite Type: Eucrite (unbrecciated)

 

Physical Description: Carol Schwarz

This achondrite has areas of shiny fusion crust remaining on all surfaces. Some sides are smooth, while others are rough and contain numerous vugs. Where there is no fusion crust the specimen is coarse grained, white and dark gray in color, with some yellowish oxidation. No individual clasts are visible. There is a very small amount of oxidation present in the interior of this stone. Dimensions: 4.5 x 3 x 3 cm

 

Petrographic Description: Brian Mason

The section shows an ophitic intergrowth of plagioclase and pigeonite; the plagioclase laths average about 1 mm long. Trace amounts of troilite and nickel-iron are present, as minute grains; the nickel-iron grains are surrounded by rusty limonitic halos. Microprobe analyses show pyroxene compositions ranging fairly continuously from Wo4En39Fs57 to Wo21En38Fs41, the range in En content being quite limited.  Plagioclase composition is range is An8-20. The meteorite is a eucrite and is unbrecciated in the thin section.

[Correction in AMN 7(1):] PCA 82501 - Ab 8-20

Data from:
  MB76
  Table 2
  Line 4835:
Origin or pseudonym:Main
Mass (g):54.4
Class:Eu "ub"
Weathering grade:A
Ferrosilite (mol%):41-57
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° 39' 28"S, 68° 38' 59"W)
Note: the NHM and MetBase coordinates are 2.7 km apart

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