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Pecora Escarpment 91020
Basic information Name: Pecora Escarpment 91020
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91020
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1749 g
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  E3
AMN 17(1)  (1994)  EL3
Meteoritical Bulletin:  MB 76  (1994)  EL3
NHM Catalogue:  5th Edition  (2000)  EL3
MetBase:  v. 7.1  (2006)  EL3
Recommended:  EL3    [explanation]

This is 1 of 28 approved meteorites classified as EL3.   [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites
Writeup from AMN 16(1):

Sample No.: PCA91020

Location: Pecora Escarpment

Dimensions (cm): 14.4 x 12.0 x 4.8

Weight (g): 1748.6

Meteorite Type: E3 Chondrite


Macroscopic Description: Robbie Marlow

This considerably weathered specimen is -50% covered with dull black fusion crust. Areas devoid of fusion crust are reddish-brown and have a polished appearance. Cleaving this coherent meteorite in half revealed a brown/black fine-grained matrix. A green colored evaporite deposit is present. Abundant dark gray inclusions/chondrules were noted. Metal is abundant.


Thin Section (,2) Description: Brian Mason

QChondrules are abundant, ranging up to 1.8 mm across; they consist of granular or radiating pyroxene, sometimes with a little olivine. The matrix consists of pyroxene grains, with 25-30% nickel-iron and a lesser amount of sulfides. Most of the pyroxene is close to MgSiO3 in composition: mean Fs1, range Fs0.2-3, with CaO 0.1-0.8%;, olivine is fosterite (FeO 0.1%, CaO 1.5%). The metal contains 0.3-0.7% Si. The meteorite is tentatively classified as an E3 chondrite.


Data from:
  Table 2
  Line 4882:
Origin or pseudonym:Halfway Icefield
Mass (g):1748.6
Weathering grade:Ce
Fayalite (mol%):0.1
Ferrosilite (mol%):0.2-3
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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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     Catalogue of Meteorites:   (85° 38'S, 68° 42'W)
     Recommended::   (85° 32' 20"S, 70° 43' 8"W)
Note: the NHM and MetBase coordinates are 20.3 km apart

     This is 1 of 44547 approved meteorites from Antarctica (plus 3805 unapproved names)
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