Meteoritical Bulletin: Entry for Pecora Escarpment 91004

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Pecora Escarpment 91004

Basic information

Name: Pecora Escarpment 91004
This is an OFFICIAL meteorite name.
Abbreviation: PCA 91004
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 25.7 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 15(2)	(1992)	Pallasite
Meteoritical Bulletin:	MB 76	(1994)	Pallasite
NHM Catalogue:	5th Edition	(2000)	Pallasite
MetBase:	v. 7.1	(2006)	Pallasite-an
Recommended:			Pallasite, PMG [explanation]

This is 1 of 58 approved meteorites (plus 1 unapproved name) classified as Pallasite, PMG. [show all]
Search for other: Main group pallasites, Metal-rich meteorites, and Pallasites

Comments:

Revised 26 May 2009: Classification from Wasson (2003)

Writeup

Writeup from AMN 15(2):

Sample No.: PCA91004; 91005

Location: Pecora Escarpment

Field Number: 5805; 6208

Dimensions (cm): 2.5 x 2.3 x 2.4; 1.5 x 1.1 x 1.1

Weight (g): 25.7; 3.8

Meteorite Type: Pallasite

Macroscopic Description: Cecilia Satterwhite and Robbie Marlow

The exteriors of these two fragments are brown and shiny. Abundant yellow (olivine) crystals and black (chromite) cyrstals are prominent in the weathered metal matrix.

Thin Section (PCA91004,2 & ,4; 91005,4), Description: Brian Mason

PCA91004,2 consists of individual olivine and chromite grains; the other sections show rounded to subhedral olivine grains, up to 3 mm in maximum dimension, in a matrix of nickel-iron. Some of the metal is rimmed with brown limonite. The olivine has uniform composition, Fa11. The meteorite is a pallasite.

Data from:
  MB76
  Table 2
  Line 4866:

Origin or pseudonym:	Main
Mass (g):	25.7
Class:	Pal
Weathering grade:	B/C
Fayalite (mol%):	11
Comments:	91004 pairing group

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 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' 22"S, 68° 57' 13"W)

Note: the NHM and MetBase coordinates are 6.6 km apart

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

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Revision
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