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Pecora Escarpment 82518
Basic information Name: Pecora Escarpment 82518
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 82518
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 21.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 7(2)  (1984)  E4
AMN 17(1)  (1994)  EH3
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 7(2):

Sample No.: PCA82518

Location: Pecora Escarpment

Field No.: 2782

Weight (gms): 21.9 Meteorite Type: E4 Chondrite

 

Physical Description: Roberta Score

The fusion crust covering PCA8 is shiny, iridescent, and ranges in color from orangish-red to brown to black. The exterior is dotted with numerous vugs that are lined with fusion crust. Dark brown matrix with abundant chondrules (as large as 3 mm in diameter) and metal make up the interior surfaces. Dimensions: 3 x 2.5 x 2 cm

Petrographic Description: Brian Mason

Chondrules are abundant, but are small, ranging from 0.3 to 0.9 mm in diameter; they consist of granular or fine-grained pyroxene. The matrix consists largely of granular pyroxene, with lesser amounts of nickel-iron and sulfides, and a little plagioclase. The meteorite is considerably weathered, with brown limonitic staining throughout the section. Microprobe analyses show that the pyroxene is almost pure MgSiO3 (FeO 0.2-0.8%, mean 0.5%; A12O3 0.07-0.7%, mean 0.5%; CaO 0.04-0.7%, mean 0.2%; TiO2, MnO, less than 0.1%). Plagioclase is almost pure albite (K2O 0.6%, CaO less than 0.1%). One grain of forsteritic olivine was analyzed. The meteorite is an enstatite chondrite, and since part of the pyroxene is polysynthetically twinned clinoenstatite, it is classified as E4.

Data from:
  MB76
  Table 2
  Line 4852:
Origin or pseudonym:Main
Mass (g):21.9
Class:EH3
Weathering grade:B
Fayalite (mol%):0.8
Comments:82518 pairing group
Catalogs:
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References: Published in Antarctic Meteorite Newsletter 7(2) (1984), 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' 30"S, 68° 35' 38"W)
Note: the NHM and MetBase coordinates are 2.9 km apart

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