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| Pecora Escarpment 91020 | |||||||||||||||||||||||||
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| 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:  1749 g | ||||||||||||||||||||||||
| Classification history: |
This is 1 of 26 approved meteorites classified as EL3. [show all] Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 3), and Enstatite-rich meteorites | ||||||||||||||||||||||||
| Writeup |
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.
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| Data from: MB76 Table 2 Line 4882: |
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| Plots: | O isotopes: | ||||||||||||||||||||||||
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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:
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Statistics: This is 1 of 43856 approved meteorites from Antarctica (plus 3802 unapproved names) | ||||||||||||||||||||||||
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