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Pecora Escarpment 91081
Basic information Name: Pecora Escarpment 91081
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91081
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 37.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  Eucrite
AMN 17(1)  (1994)  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 95 approved meteorites classified as Eucrite-unbr.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 16(1):

Sample No.: PCA91081

Location: Pecora Escarpment

Dimensions (cm): 3.4 x 3.9 x 2.0

Weight (g): 37.8 Meteorite

Type: Eucrite

 

Macroscopic Description: Cecilia Satterwhite Thirty percent of this meteorite is covered with black fusion crust that is shiny in some areas. Areas devoid of fusion crust have a rough texture, and are medium gray. The interior is light to medium gray with abundant light and dark gray inclusions. Minor amount of evaporite deposit is present.

 

Thin Section (,2) Description: Brian Mason

The section shows a fine-grained ophitic intergrowth of pyroxene 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. Microprobe analyses show pyroxene compositions ranging fairly continuously from Wo3Fs62 to Wo27Fs40, the range in En content being quite limited. Plagioclase composition is An86-91. The meteorite is a eucrite; it is very similar to PCA82502, and the possibility of pairing should be considered. PCA91083 is paired with 91081.

 

Data from:
  MB76
  Table 2
  Line 4930:
Origin or pseudonym:Main
Mass (g):37.8
Class:Eu "ub"
Weathering grade:Be
Ferrosilite (mol%):40-62
Comments:82502 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 16(1) (1993), 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' 53"S, 68° 49' 30"W)
Note: the NHM and MetBase coordinates are 5.5 km apart

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