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Pecora Escarpment 91077
Basic information Name: Pecora Escarpment 91077
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91077
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 18.3 g
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  Diogenite
Meteoritical Bulletin:  MB 76  (1994)  Diogenite
NHM Catalogue:  5th Edition  (2000)  Diogenite
MetBase:  v. 7.1  (2006)  Diogenite
Recommended:  Diogenite    [explanation]

This is 1 of 511 approved meteorites classified as Diogenite.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Writeup from AMN 16(1):

Sample No.: PCA91077

Location: Pecora Escarpment

Dimensions (cm): 3.5 x 3.5 x 0.8

Weight (g): 18.3 Meteorite

Type: Diogenite


Macroscopic Description: Carol Schwarz

This dome-shaped fragment has very black fusion crust covering about 60% of its surface. Small areas have been physically plucked out. One exterior surface shows a light gray-green matrix with small darker clasts. The material exposed by chipping of this meteorite is gray with darker gray clasts.


Thin Section (,2) Description: Brian Mason

The section consists almost entirely of orthopyroxene clasts, up to 1.5 mm in maximum dimension, in a matrix of comminuted orthopyroxene. The pyroxene is uniform in composition, Wo3Fs25. The meteorite is a diogenite.


Data from:
  Table 2
  Line 4926:
Origin or pseudonym:Main
Mass (g):18.3
Weathering grade:A
Ferrosilite (mol%):25
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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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     Catalogue of Meteorites:   (85° 38'S, 68° 42'W)
     Recommended::   (85° 41' 47"S, 69° 4' 19"W)
Note: the NHM and MetBase coordinates are 7.7 km apart

     This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names)
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