Meteoritical Bulletin: Entry for Pecora Escarpment 91077

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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: 18.3 g

Classification
history:

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 522 approved meteorites classified as Diogenite. [show all]
Search for other: Achondrites, Diogenites, and HED achondrites

Writeup

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:
  MB76
  Table 2
  Line 4926:

Origin or pseudonym:	Main
Mass (g):	18.3
Class:	Diog
Weathering grade:	A
Ferrosilite (mol%):	25

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):

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° 41' 47"S, 69° 4' 19"W)

Note: the NHM and MetBase coordinates are 7.7 km apart

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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Revision
history:

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