Meteoritical Bulletin: Entry for Pecora Escarpment 91470

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Pecora Escarpment 91470

Basic information

Name: Pecora Escarpment 91470
This is an OFFICIAL meteorite name.
Abbreviation: PCA 91470
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass: 33.5 g

Classification
history:

Antarctic Meteorite Newsletter:	AMN 16(2)	(1993)	CK4
Meteoritical Bulletin:	MB 76	(1994)	CK4
NHM Catalogue:	5th Edition	(2000)	CK4
MetBase:	v. 7.1	(2006)	CK4
Recommended:			CK4 [explanation]

This is 1 of 128 approved meteorites classified as CK4. [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (equilibrated), CK chondrites, CK chondrites (type 4-6), and CV-CK clan chondrites

Writeup

Writeup from AMN 16(2):

Sample No.: PCA91470

Location: Pecora Escarpment

Dimensions (cm): 3.0 x 3.0 x 1.8

Weight (g): 33.5

Meteorite Type: CK4 chondrite

Macroscopic Description: Robbie Marlow

Ninety percent of the exterior of this carbonaceous chondrite is covered with smooth, dull, black fusion crust. The interior is fight in color and has a fine-grained matrix. Several dark millimeter sized inclusions are visible. The meteorite is friable.

Thin Section (2) Description: Brian Mason

The section shows an aggregate of small (0.02-0.07 mm) olivine grains and minor opaque material, with a few chondrules up to 1.8 mm across. The opaque material consists of magnetite and pentlandite. One grain of green spinal (hercynite) was noted. Olivine composition is Fa33; a few grains of plagioclase, An50-60, were analyzed. Hercynite composition is Al1.5Fe1.2Mg0.3O4. The meteorite is a C4 chondrite of the Karoonda subtype.

Data from:
  MB76
  Table 2
  Line 5263:

Origin or pseudonym:	Main
Mass (g):	33.5
Class:	CK4
Weathering grade:	A/B
Fayalite (mol%):	33

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' 38"S, 68° 15' 58"W)

Note: the NHM and MetBase coordinates are 6.1 km apart

Statistics:
This is 1 of 44547 approved meteorites from Antarctica (plus 3802 unapproved names)

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Revision
history:

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