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Roberts Massif 04261
Basic information Name: Roberts Massif 04261
     This is an OFFICIAL meteorite name.
Abbreviation: RBT 04261
Observed fall: No
Year found: 2004
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 78.8 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 30(1)  (2007)  Shergottite
Meteoritical Bulletin:  MB 92  (2007)  Martian
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 192 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 16 Feb 2007
Writeuphelp
Writeup from AMN 30(1):
Sample No.: RBT 04261; RBT 04262
Location: Roberts Massif
Field No.: 16331; 15145
Dimensions (cm):   4.0x3.5x2.5; 6.5x5.5x3.5
Weight (g): 78.763; 204.6
Meteorite Type: Shergottite


Macroscopic Description: Kathleen McBride
30-50% of the exterior surfaces have brown/black, rough textured fusion crust with glassy spots. The interior is soft and tan-gray in color with a sandy texture and low metal content.


Thin Section (,2) Description: Tim McCoy and Valerie Reynolds
These meteorites are so similar that a single description suffices. The sections are composed of a coarse-grained assemblage of pyroxene, olivine and maskelynite with grain sizes reaching up to 4 mm. Sulfides and oxides are present, as are shock melt veins and pockets. Olivine is Fa28-40; pyroxenes exhibit a range of compositions from pigeonite to augite (Fs16-32Wo7-38; Fe/Mn ~ 22-30); feldspar is intermediate in composition (An30-55). The meteorites are olivine-phyric shergottites.



Thin Section Images

Cross-Polarized
Light RBT 04261
Plane-Polarized
Light RBT 04261
RBT 04261 - Cross-Polarized Light RBT 04261 - Plane-Polarized Light
Cross-Polarized
Light RBT 04262
Plane-Polarized
Light RBT 04262
<a href=RBT 04262 - Cross-Polarized Light"> <a href=RBT 04262 - Plane-Polarized Light">



Lab Images

RBT 04261 & <a href=RBT 04262" border="0">

Data from:
  MB92
  Table 3
  Line 1154:
Mass (g):78.8
Class:Martian
Weathering grade:B
Fayalite (mol%):39
Ferrosilite (mol%):20-27
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:
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
ANSMET / NASA   
Geography:

Antarctica
Coordinates:Unknown.

Statistics:
     This is 1 of 39173 approved meteorites from Antarctica (plus 5051 unapproved names)

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