MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 30 Sep 2023
Search for: Search type: Search limits: Display: Publication:
Text help
Starts with
Sounds like
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
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:help 25.7 g
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 57 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 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:
  Table 2
  Line 4866:
Origin or pseudonym:Main
Mass (g):25.7
Weathering grade:B/C
Fayalite (mol%):11
Comments:91004 pairing group
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)
Find references in NASA ADS:
Find references in Google Scholar:

     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

     This is 1 of 44048 approved meteorites from Antarctica (plus 3802 unapproved names)
Proximity search:
Find nearby meteorites: enter search radius (km):

Direct link to this page