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Pecora Escarpment 01030
Basic information Name: Pecora Escarpment 01030
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 01030
Observed fall: No
Year found: 2002
Country: Antarctica [Collected by Planetary Studies Foundation (US)]
Mass:help 14.2 g
Classification
  history:
Meteoritical Bulletin:  MB 100  (2012)  Diogenite-pm 
Recommended:  Diogenite-pm    [explanation]

This is 1 of 38 approved meteorites classified as Diogenite-pm.   [show all]
Search for other: Achondrites, Diogenites, and HED achondrites
Comments: Approved 19 Jan 2012
Writeuphelp
Writeup from MB 100:

Pecora Escarpment 01030 (PCA 01030)        85°39.259’S, 68°34.323’W

Antarctica

Found: 2002 Jan 20

Classification: HED achondrite (Diogenite, polymict)

Petrography: Fragmental breccia consisting mostly of disaggregated material from diogenite protoliths, plus grains of calcic plagioclase and exsolved pigeonite derived probably from cumulate eucrites. Accessory minerals include chromite, ilmenite and troilite. Orthopyroxene exhibits undulose extinction and plagioclase is partly recrystallized (exhibiting complex twinning and some polygonal subgrains). Eucritic material makes up less than 10 vol.% of the specimen.

Geochemistry: Diogenitic orthopyroxene Fs18.7Wo1.3, Fs24.4Wo3.0, rim Fs34.0Wo3.5, Fe/Mn=28-32; orthopyroxene host Fs51.2Wo1.6, Fe/Mn=27; clinopyroxene exsolution lamellae Fs20.9-25.3Wo43.9-41.3.

Classification: Diogenite-pmict

Specimens: Remaining stone plus one polished thin section at FMNH

Data from:
  MB100
  Table 1
  Line 1770:
Origin or pseudonym:Pecora Escarpment
Date:2002 Jan 20
Latitude:85°39.259'S
Longitude:68°34.323'W
Mass (g):14.2
Pieces:1
Class:Diogenite-pm
Shock stage:moderate
Weathering grade:low
Fayalite (mol%):44.5
Ferrosilite (mol%):24.4; 51.2; 20.9-25.3
Wollastonite (mol%):3.0; 1.6; 43.9-41.3
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):14.2
Type spec location:FMNH
Main mass:FMNH
Finder:A. Mortvedt
Comments:Submitted by P. Sipiera
Institutions
   and collections
FMNH: Department of Geology The Field Museum of Natural History 1400 South Lake Shore Drive Chicago, IL 60605-2496, USA, United States; Website (institutional address; updated 16 Nov 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 100, MAPS 49, E1-E101 (2014)
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Geography:

Antarctica
Coordinates:
     Recommended::   (85° 39' 16"S, 68° 34' 19"W)

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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