Meteoritical Bulletin: Entry for Pecora Escarpment 91245

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Pecora Escarpment 91245

Basic information

Name: Pecora Escarpment 91245
This is an OFFICIAL meteorite name.
Abbreviation: PCA 91245
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 17.8 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 16(2)	(1993)	Eucrite
	AMN 17(1)	(1994)	Eucrite-unbr
Meteoritical Bulletin:	MB 76	(1994)	Eucrite-unbr
NHM Catalogue:	5th Edition	(2000)	Eucrite-unbr
MetBase:	v. 7.1	(2006)	Eucrite-mmict
Recommended:			Eucrite-unbr [explanation]

This is 1 of 136 approved meteorites classified as Eucrite-unbr. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Writeup

Writeup from AMN 16(2):

Sample No.: PCA91245

Location: Pecora Escarpment

Dimensions (cm): 3.0 x 1.5 x 1.2

Weight (g): 17.8

Meteorite Type: Unbrecciated Eucrite

Macroscopic Description: Cecilia Satterwhite

Seventy percent of the exterior of PCA91245 is covered with shiny, black fusion crust. The interior is composed of coarse-grained laths of pyroxene and plagioclase. No inclusions were noted. Oxidation is minor.

Thin Section (,3) Description: Brian Mason

The meteorite is a coarse-grained intergrowth of plagioclase and pyroxene with a gabbroic texture; individual grains are up to 3 mm in maximum dimension. Microprobe analyses show pyroxene compositions ranging from Wo4Fs58 to Wo42Fs25, the range in En content being quite limited. Plagioclase composition is An87-93. The meteorite is an unbrecciated eucrite. It is very similar to PCA91078, with which it is probably paired.

Data from:
  MB76
  Table 2
  Line 5043:

Origin or pseudonym:	Main
Mass (g):	17.8
Class:	Eu "ub"
Weathering grade:	B
Ferrosilite (mol%):	25-58
Comments:	91078 pairing group

Catalogs:

Search for specimens in the Smithsonian Institution collection (U.S.):	Require SI photo
Search for this meteorite in the NASA/JSC database (U.S.):

References:

Published in Antarctic Meteorite Newsletter 16(2) (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° 40' 39"S, 68° 43' 6"W)

Note: the NHM and MetBase coordinates are 4.9 km apart

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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