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Pecora Escarpment 91006
Basic information Name: Pecora Escarpment 91006
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91006
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 104.4 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 15(2)  (1992)  Eucrite
AMN 17(1)  (1994)  Eucrite-br
Meteoritical Bulletin:  MB 76  (1994)  Eucrite-br
NHM Catalogue:  5th Edition  (2000)  Eucrite-br
MetBase:  v. 7.1  (2006)  Eucrite
Recommended:  Eucrite-br    [explanation]

This is 1 of 179 approved meteorites classified as Eucrite-br.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Writeuphelp
Writeup from AMN 15(2):

Sample No.: PCA91006

Location: Pecora Escarpment

Field Number: 7707

Dimensions (cm): 7.3 x 4.5 x 2.2

Weight (g): 104.4

Meteorite Type: Eucrite

 

Macroscopic Description: Cecilia Satterwhite

Seventy percent of this eucrite is covered with dark black fusion crust, which is pitted, fractured and shiny in some areas. Flow marks are present. The interior is light to medium gray and coarse grained with abundant clasts as large as 1 cm. The clasts range in color from white to coarse-grained beige and black (basaltic). Some clasts are oxidized. Metal is visible.

 

Thin Section (,5) Description: Brian Mason

The section shows numerous clasts, up to 3.6 mm in greatest dimension, in a fine-grained matrix of comminuted pyroxene and plagioclase with accessory opaques. Most of the clasts consist of pyroxene and plagioclase with coarse to fine texture, but some consist entirely of plagioclase. Pyroxene compositions show two groups, low-calcium (Wo2-5Fs39-55) and high-calcium (Wo38-42Fs16-30), with a few grains of intermediate composition. Plagioclase compositions are somewhat variable, An78-91. The meteorite is a eucrite.

 

Data from:
  MB76
  Table 2
  Line 4868:
Origin or pseudonym:Main
Mass (g):104.4
Class:Eu "br"
Weathering grade:A/B
Ferrosilite (mol%):16-55
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 15(2) (1992), 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° 41' 50"S, 67° 40' 26"W)
Note: the NHM and MetBase coordinates are 11.2 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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