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Pecora Escarpment 91129
Basic information Name: Pecora Escarpment 91129
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91129
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 4.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(2)  (1993)  EL3
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 137 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(2):

Sample No.: PCA91129; 91383; 91398; 91444; 91451; 91461; 91475; 91477; 91481

Location: Pecora Escarpment

Dimensions (cm): 2.2 x 1.7 x 0.5; 3.5 x 3.2 x 2.7; 2.6 x 1.1x 0.3; 1.5 x 1.5 x 0.7; 2.6 x 2.2 x 1.5; 4.0 x 1.7 x 2.0; 2.8 x 3.0 x 2.1; 2.5 x 2.0 x 1.4; 1.0 x 0.9 x 0.4

Weight (g): 4.3; 48.9; 2.6; 2.6; 17.7; 27.5; 29.9; 16.3; 0.6

Meteorite Type: EL3 chondrite

 

Macroscopic Description: Robbie Marlow

Five of these chondrites are mostly covered with brown, oxidation-haloed fusion crust. The interior of all the stones is dark brown. Abundant chondrules are present, several were noted protruding from the exterior surfaces. Evaporite deposit was noted on 91444.

 

Thin Section (PCA91129,2; 91383,2; 91398,2; 91451,2) Description: Brian Mason

These sections are so similar that a single description suffices. Chondrules are abundant, ranging up to 1.2 mm across; they consist of prismatic 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, with a few grains showing minor iron content, up to 8% FeO. The feldspar is almost pure albite. The nickel-iron contains 2.7-2.9% Si. The meteorites are classified as EL3 chondrites and are paired with PCA82518 group.

 

Data from:
  MB76
  Table 2
  Line 4967:
Origin or pseudonym:Main
Mass (g):4.3
Class:EH3
Weathering grade:B/C
Ferrosilite (mol%):0.2-2.0
Comments:82518 pairing group
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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° 39' 46"S, 68° 39' 39"W)
Note: the NHM and MetBase coordinates are 3.3 km apart

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