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Pecora Escarpment 91245
Basic information Name: Pecora Escarpment 91245
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91245
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 17.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(2)  (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-mmict
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(2):

Sample No.: PCA91245

Location: Pecora Escarpment

Dimensions (cm): 3.0 x 1.5 x 1.2

Weight (g): 17.8

Meteorite Type: Unbrecciated Eucrite

 

Macroscopic Description: Cecilia Satterwhite

Seventy percent of the exterior of PCA91245 is covered with shiny, black fusion crust. The interior is composed of coarse-grained laths of pyroxene and plagioclase. No inclusions were noted. Oxidation is minor.

 

Thin Section (,3) 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. Microprobe analyses show pyroxene compositions ranging from Wo4Fs58 to Wo42Fs25, the range in En content being quite limited. Plagioclase composition is An87-93. The meteorite is an unbrecciated eucrite. It is very similar to PCA91078, with which it is probably paired.

 

Data from:
  MB76
  Table 2
  Line 5043:
Origin or pseudonym:Main
Mass (g):17.8
Class:Eu "ub"
Weathering grade:B
Ferrosilite (mol%):25-58
Comments:91078 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 16(2) (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' 39"S, 68° 43' 6"W)
Note: the NHM and MetBase coordinates are 4.9 km apart

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