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Pecora Escarpment 91241
Basic information Name: Pecora Escarpment 91241
     This is an OFFICIAL meteorite name.
Abbreviation: PCA 91241
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 75 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  Chondrite-ung
AMN 17(1)  (1994)  Carlisle Lakes-like
Meteoritical Bulletin:  MB 76  (1994)  R
NHM Catalogue:  5th Edition  (2000)  R
MetBase:  v. 7.1  (2006)  R3.8-6
Antarctic Meteorite Newsletter:  AMN 31(1)  (2008)  R3.8-6
Recommended:  R3.8-6    [explanation]

This is 1 of 4 approved meteorites classified as R3.8-6.   [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)
Writeuphelp
Writeup from AMN 16(1):

Sample No.: PCA91241

Location: Pecora Escarpment

Dimensions (cm): 4.5 x 4.0 x 1.6

Weight (g): 75.0

Meteorite Type: Ungrouped Chondrite

 

Macroscopic Description: Cecilia Satterwhite

Frothy, brown, and black fusion crust covers 50% of the exterior of this meteorite. The interior of PCA91241 consists of medium gray matrix. A thin discontinuous weathering rind is present as are areas of heavy oxidation. Numerous small inclusions that are white to light gray in color are visible. Evaporite deposit is present on the interior surfaces.

 

Thin Section (,2) Description: Brian Mason

The section shows numerous polycrystalline silicate clasts (up to 1.8 mm in maximum dimension), some small chondrules (up to 0.5 mm across), and mineral grains in a finely-granular gray matrix. A moderate amount of sulfides (both troilite and pentlandite) is present, much of it as minute grains disseminated through the matrix. No nickel-iron was seen. The meteorite appears to be unweathered. Microprobe analyses show olivine compositions with a prominent peak at Fa38, with a few more magnesian grains. The meteorite can be confidently paired with PCA91002, an ungrouped chondrite belonging to the Carlisle Lakes grouplet (Geochim. Cosmochim. Acta, v. 55, p. 2657, 1991).

 

Data from:
  MB76
  Table 2
  Line 5039:
Origin or pseudonym:Main
Mass (g):75
Class:"R"
Weathering grade:Be
Fayalite (mol%):20-38
Comments:91002 pairing group
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:

Antarctica
Coordinates:
     Catalogue of Meteorites:   (85° 38'S, 68° 42'W)
     Recommended::   (85° 39' 27"S, 68° 2' 52"W)
Note: the NHM and MetBase coordinates are 6.2 km apart

Statistics:
     This is 1 of 38940 approved meteorites from Antarctica (plus 5051 unapproved names)
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