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Roberts Massif 04260
Basic information Name: Roberts Massif 04260
     This is an OFFICIAL meteorite name.
Abbreviation: RBT 04260
Observed fall: No
Year found: 2004
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 86.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 30(1)  (2007)  CM2
Meteoritical Bulletin:  MB 92  (2007)  CM2
Recommended:  CM2    [explanation]

This is 1 of 540 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 16 Feb 2007
Writeuphelp
Writeup from AMN 30(1):
Sample No.: RBT 04260
Location: Roberts Massif
Field No.: 16425
Dimensions (cm):   6.5x4.5x2.0
Weight (g): 86.326
Meteorite Type: CM2 Chondrite


Macroscopic Description: Kathleen McBride
The exterior has a purplish crust on 20% of its surface. The fractured interior is black with white evaporites. Evaporites cover most of the interior of this sample.


Thin Section (,2) Description: Tim McCoy and Valerie Reynolds
The section consist of a few small chondrules (up to 0.5 mm), mineral grains and CAIs set in a black matrix; rare metal and sulfide grains are present. Many chondrules are aqueously altered. Olivine compositions are Fa0-1; orthopyroxene is Fs1. The matrix consists dominantly of an Fe-rich serpentine. The meteorite is a CM2 chondrite.



Thin Section Images

Cross-Polarized
Light RBT 04260
Plane-Polarized
Light RBT 04260
RBT 04260 - Cross-Polarized Light RBT 04260 - Plane-Polarized Light



Lab Images

RBT 04260

Data from:
  MB92
  Table 3
  Line 1153:
Mass (g):86.3
Class:CM2
Weathering grade:CE
Fayalite (mol%):0-1
Ferrosilite (mol%):1
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 30(1) (2007), JSC, Houston
Published in Meteoritical Bulletin, no. 92, MAPS 42, 1647-1694 (2007)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photographs from AMN:
JSC A photo is in the write-up above
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 40129 approved meteorites from Antarctica (plus 4494 unapproved names)

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