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Pecora Escarpment 91085
Basic information Name: Pecora Escarpment 91085
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91085
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 79.6 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  E4
Meteoritical Bulletin:  MB 76  (1994)  EH3
NHM Catalogue:  5th Edition  (2000)  EH3
MetBase:  v. 7.1  (2006)  EH3
Recommended:  EH3    [explanation]

This is 1 of 138 approved meteorites classified as EH3.   [show all]
Search for other: EH chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Writeuphelp
Writeup from AMN 16(1):

Sample No.: PCA91085; 91114; 91119; 91125;91238

Location: Pecora Escarpment

Dimensions (cm): 4.5 x 3.5 x 2.0; 1.5 x 2.8 x 1.6; 0.5 x 0.7 x 0.2; 1.5 x 1.2 x 1.0; 4.5 x 2.5 x 3.3

Weight (g): 79.6; 18.0; 0.3; 3.3; 96.2

Meteorite Type: E4 Chondrite

 

Macroscopic Description: Robbie Marlow and. Cecilia Satterwhite

The fusion crust present on these specimens range from 0 to 90%; is dark brown in color, and has large oxidation haloes. Chondrules have weathered out and are protruding from the surface of 91114. The interior matrices have weathered to a dark brown color. Abundant chondrules are present in all specimens. Evaporite deposits are present on interior and exterior surfaces of 91085, and 91238.

 

Thin Section (91085,2; 91114,2; 91119,2; 91125,2; 91238,2) Description: Brian Mason

These sections are so similar that a single description suffices. Chondrules are abundant, ranging up to 0.9 mm across; they consist of granular or fine-grained pyroxene. The groundmass consists largely of granular pyroxene, with lesser amounts of nickel-iron and sulfides, and a little feldspar and an SiO2 phase, probably cristobalite. Microprobe analyses show that the pyroxene is almost pure MgSiO3 (FeO up 1.7%, CaO up to 0.4%). The feldspar is almost pure albite (K2O up to 0.6%, CaO up to 0.7%). One grain of forsteritic olivine (FeO 1.6%) was analyzed in 91085. The nickel-iron contains 2.3-2.9% Si. The meteorites are classified as E4 chondrites; they are very similar to PCA82518, and the possibility of pairing should be considered. The following PCA 91XXX meteorites also belong to this pairing group: 91127, 91254, 91258, 91298, 91300, 91303.

 

Data from:
  MB76
  Table 2
  Line 4934:
Origin or pseudonym:Damschroder
Mass (g):79.6
Class:EH3
Weathering grade:B/Ce
Fayalite (mol%):2
Ferrosilite (mol%):0.8
Comments:82518 pairing group
Catalogs:
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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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Geography:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (85° 38'S, 68° 42'W)
     Recommended::   (85° 39' 3"S, 69° 4' 52"W)
Note: the NHM and MetBase coordinates are 3.8 km apart

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)
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