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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:help 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 105 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
Writeuphelp
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:
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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 39173 approved meteorites from Antarctica (plus 5051 unapproved names)
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