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| Pecora Escarpment 82506 | |||||||||||||||||||||
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| 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:  5.32 kg | ||||||||||||||||||||
| Classification history: |
This is 1 of 660 approved meteorites classified as Ureilite. [show all] Search for other: Achondrites, Ureilites | ||||||||||||||||||||
| Writeup |
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: MB76 Table 2 Line 4840: |
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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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Statistics: This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
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| Revision history: |
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