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Pecora Escarpment 91082 | |||||||||||||||||||||
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Basic information | Name: Pecora Escarpment 91082 This is an OFFICIAL meteorite name. Abbreviation: PCA 91082 Observed fall: No Year found: 1991 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: ![]() | ||||||||||||||||||||
Classification history: |
This is 1 of 183 approved meteorites classified as CR2. [show all] Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites | ||||||||||||||||||||
Writeup![]() |
Writeup from AMN 16(1):
Sample No.: PCA91082 Location: Pecora Escarpment Dimensions (cm): 4.0 x 2.5 x 1.7 Weight (g): 37.9 Meteorite Type: C2R Chondrite
Macroscopic Description: Cecilia Satterwhite The fusion crust on this sample is black, fractured, and shiny in areas. The interior is made up of jet black matrix with abundant light inclusions. The inclusions are very small but can be discerned with the naked eye. Some evaporite deposit was noted as was oxidized matrix.
Thin Section (,2) Description: Brian Mason The section shows a close-packed aggregate of large chondrules (maximum diameter 3 mm) rimmed with black matrix. About 10% of nickel-iron is present, in part concentrated as rims to the chondrules; troilite is present in small amount; about 1%. Chondrule types include granular olivine, barred olivine, and granular clinoenstatite (polysynthetically twinned). The matrix includes some pale green phyllosilicate. Weathering is indicated by pervasive limonitic staining. Microprobe analyses show Mg-rich olivine and pyroxene of somewhat variable composition; olivine, Fa1-5; pyroxene, Fs1-8. The meteorite is tentatively classified as a C2 chondrite of Renazzo subtype, although the amount of carbonaceous matrix is unusually low.
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Data from: MB76 Table 2 Line 4931: |
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Catalogs: |
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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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Geography:![]() |
Statistics: This is 1 of 43700 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||
Proximity search: |