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Pecora Escarpment 82506
Basic information Name: Pecora Escarpment 82506
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 82506
Observed fall: No
Year found: 1982
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 5.32 kg
Antarctic Meteorite Newsletter:  AMN 7(1)  (1984)  Ureilite
Meteoritical Bulletin:  MB 76  (1994)  Ureilite
NHM Catalogue:  5th Edition  (2000)  Ureilite
MetBase:  v. 7.1  (2006)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 604 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Writeup from AMN 7(1):

Sample No.: PCA82506

Location: Pecora Escarpment

Field No.: 2705

Weight (gms): 5316.0

Meteorite Type: Ureilite


Physical Description: Carol Schwarz

Patches of fusion crust cover 75% of this achondrite. In some areas the fusion crust has a blistery texture. Areas with little fusion crust are greenish to brown in color. The interior is grayish-green to brown in color. The matrix has a blocky texture and many crystal faces are evident. Dimensions: 22 x 16 x 9 cm


Petrographic Description: Brian Mason

The section shows an aggregate of anhedral to subhedral grains (0.6-3 mm across) of olivine and pyroxene. Individual grains are rimmed by carbonaceous material which includes thin stringers of troilite. Trace amounts of nickel-iron originally present have been largely weathered to limonite. Microprobe analyses show olivine of uniform composition (Fa21) with notable high CaO content (0.3%); the pyroxene is pigeonite with composition Wo6Fs18En76. The meteorite is a ureilite; some grains show undulose extinction but apart from that the meteorite appears to be relatively unshocked compared to most ureilites.

Data from:
  Table 2
  Line 4840:
Origin or pseudonym:Main
Mass (g):5316
Weathering grade:A/Be
Fayalite (mol%):21
Ferrosilite (mol%):18
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References: Published in Antarctic Meteorite Newsletter 7(1) (1984), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
MeteoriteCollector.org - USNM - Smithsonian   

     Catalogue of Meteorites:   (85° 38'S, 68° 42'W)
     Recommended::   (85° 41' 28"S, 67° 42' 47"W)
Note: the NHM and MetBase coordinates are 10.5 km apart

     This is 1 of 43332 approved meteorites from Antarctica (plus 3802 unapproved names)
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