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Pecora Escarpment 91078
Basic information Name: Pecora Escarpment 91078
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91078
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 20.9 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-br
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 16(1):

Sample No.: PCA91078

Location: Pecora Escarpment

Dimensions (cm): 3.5 x 2.5 x 2.0

Weight (g): 20.9

Meteorite Type: Unbrecciated Eucrite

 

Macroscopic Description: Carol Schwarz

About 35% of this achondrite has very shiny black fusion crust. The exterior devoid of fusion crust has large white and dark grains. The interior is coarse-grained consisting of white plagioclase grains and black grains with some yellowish oxidation. This meteorite is moderately friable.

 

Thin Section (,2) Description: Brian Mason

The meteorite is a coarse-grained intergrowth of plagioclase and pyroxene with a gabbroic texture; individual grains are up to 3 mm in maximum dimension. Accessory tridymite is also present. Most of the pyroxene has the composition Wo5Fs55 but some calcic pyroxene, Wo33Fs33 - Wo40Fs26, was also analyzed. Plagioclase composition is An76-92. The meteorite is an unbrecciated eucrite.

 

Data from:
  MB76
  Table 2
  Line 4927:
Origin or pseudonym:Main
Mass (g):20.9
Class:Eu "ub"
Weathering grade:A/B
Ferrosilite (mol%):26-55
Comments:91078 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' 46"S, 68° 44' 43"W)
Note: the NHM and MetBase coordinates are 5.2 km apart

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