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Pecora Escarpment 91328
Basic information Name: Pecora Escarpment 91328
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91328
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 11 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(2)  (1993)  Chondrite-ung
AMN 17(1)  (1994)  ALH85085-like
Meteoritical Bulletin:  MB 76  (1994)  CH
NHM Catalogue:  5th Edition  (2000)  CH
MetBase:  v. 7.1  (2006)  CH3
Recommended:  CH3    [explanation]

This is 1 of 26 approved meteorites classified as CH3.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CH chondrites, CH-CB family, and Metal-rich meteorites
Writeuphelp
Writeup from AMN 16(2):

Sample No.: PCA91328; 91452; 91467

Location: Pecora Escarpment

Dimensions (cm): 2.2 x 2.1 x 1.0; 2.7 x 2.0 x 0.9; 2.6 x 3.4 x 3.0

Weight (g): 11.0; 7.2; 46.9

Meteorite Type: Chondrite (ungrouped)

 

Macroscopic Description: Robbie Marlow and Cecilia Satterwhite

Smooth, brown fusion crust covers 50% of each of these three meteorite fragments. Numerous fractures penetrate the interior of PCA91328. The exposed interiors are dark brown to black and fine-grained. A few very small inclusions were noted in PCA91452 and 91467. Weathering is extensive.

 

Thin Section (PCA91328,2; 91452,2; 91467,2) Description: Brian Mason

The sections show a few c hondrules, up to 0.3 mm across, abundant pyroxene grains (0.02-0.08 mm), and a considerable amount of nickel-iron. The meteorite is severely weathered, with limonitic staining throughout the sections. Most of the pyroxene is close to MgSiO3 in composition, but ranges up to Fs16. The metal contains less than 0.1% Si. The meteorite is classified as an ungrouped chondrite; it is essentially identical with PAT 91546 and ALH 85085 (Earth Planet. Sci. Letters, v. 91, p.1-64,1988).

 

Data from:
  MB76
  Table 2
  Line 5121:
Origin or pseudonym:Kink Bowl
Mass (g):11
Class:"CH"
Weathering grade:C
Ferrosilite (mol%):1-16
Comments:91328 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 16(2) (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° 40' 43"S, 69° 4' 12"W)
Note: the NHM and MetBase coordinates are 6 km apart

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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