Meteoritical Bulletin: Entry for Pecora Escarpment 91007

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Pecora Escarpment 91007

Basic information

Name: Pecora Escarpment 91007
This is an OFFICIAL meteorite name.
Abbreviation: PCA 91007
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 224 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 15(2)	(1992)	Eucrite
	AMN 17(1)	(1994)	Eucrite-br
Meteoritical Bulletin:	MB 76	(1994)	Eucrite-br
NHM Catalogue:	5th Edition	(2000)	Eucrite-br
MetBase:	v. 7.1	(2006)	Eucrite-mmict
Recommended:			Eucrite-br [explanation]

This is 1 of 218 approved meteorites classified as Eucrite-br. [show all]
Search for other: Achondrites, Eucrites, and HED achondrites

Writeup

Writeup from AMN 15(2):

Sample No.: PCA91007

Location: Pecora Escarpment

Field Number: 7729

Dimensions (cm): 6.8 x 4.8 x 4.5

Weight (g): 223.6

Meteorite Type: Eucrite

Macroscopic Description: Cecilia Satterwhite,

Shiny, black fusion crust covers 40% of the exterior of PCA91007. The interior matrix is medium to coarse grained, and medium gray in color. Abundant green crystals, and minor amounts of metal and oxidation characterize this eucrite.

Thin Section (,8) Description: Brian Mason

The section shows a uniform fine-grained aggregate of granular pyroxene and acicular plagioclase (plagioclase needles up to 0.3 mm long). The proportion of pyroxene to plagioclase is approximately 2:1. Microprobe analyses show pyroxene compositions ranging fairly continuously from Wo5Fs5 6 to Wo30Fs35, the range in En content being quite limited. Plagioclase composition is somewhat variable, An80-91. The meteorite is a eucrite.

Data from:
  MB76
  Table 2
  Line 4869:

Origin or pseudonym:	Main
Mass (g):	223.6
Class:	Eu "br"
Weathering grade:	A/Be
Ferrosilite (mol%):	35-56
Comments:	NTL=5±1

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 15(2) (1992), 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' 54"S, 68° 46' 41"W)

Note: the NHM and MetBase coordinates are 5.4 km apart

Statistics:
This is 1 of 43840 approved meteorites from Antarctica (plus 3802 unapproved names)

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