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Roberts Massif 04309
Basic information Name: Roberts Massif 04309
     This is an OFFICIAL meteorite name.
Abbreviation: RBT 04309
Observed fall: No
Year found: 2004
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 1.3 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 29(2)  (2006)  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 1 Sep 2006
Writeuphelp
Writeup from AMN 29(2):
Sample No.: RBT 04309
Location: Roberts Massif
Field No.: 15148
Dimensions (cm):   1.75x1.0x0.5
Weight (g): 1.258
Meteorite Type: CM2 Chondrite


Macroscopic Description: Kathleen McBride
100% of the exterior is covered with brown/black fusion crust with polygonal fractures. The interior is a black matrix with evaporites and dark chondrules.


Thin Section (,2) Description: Tim McCoy and Emma Bullock
The section consists 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. Olivine compositions are Fa1-50. The matrix consists pre-dominantly of an Fe-rich serpentine. The meteorite is a CM2 chondrite.



Thin Section Images

Cross-Polarized LightPlane-Polarized LightReflected Light
LAP 031220 - Cross-Polarized Light LAP 031220 - Plane-Polarized Light LAP 031220 - Reflected Light



Lab Images

RBT 04309 Image North

Data from:
  MB92
  Table 3
  Line 1194:
Mass (g):1.3
Class:CM2
Weathering grade:BE
Fayalite (mol%):1-50
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 29(2) (2006), 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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