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Roberts Massif 04239
Basic information Name: Roberts Massif 04239
     This is an OFFICIAL meteorite name.
Abbreviation: RBT 04239
Observed fall: No
Year found: 2004
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 12 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 29(2)  (2006)  Achondrite-ung
Meteoritical Bulletin:  MB 92  (2007)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 99 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 1 Sep 2006
Writeuphelp
Writeup from AMN 29(2):
Sample No.: RBT 04239
Location: Roberts Massif
Field No.: 16319
Dimensions (cm):   2.5x2.0x1.25
Weight (g): 11.964
Meteorite Type: Achondrite-Ungrouped


Macroscopic Description: Kathleen McBride
90% of the exterior has brown/black fusion crust with polygonal fractures and oxidation halos. The interior is rusty black with high metal content.


Thin Section (,2) Description: Tim McCoy
The section consists of an olivine-rich groundmass with pyroxene, plagioclase, metal and troilite present. Micron-sized metal-sulfide veinlets are abundant and a few relict chondrules are present. Olivine is Fa24, orthopyroxene is Fs20Wo2, clinopyroxene is Fs8Wo44 and plagioclase is An10Or5. The meteorite may be an ungrouped primitive achondrite and has some similarities to the Divnoe meteorite (Petaev et al., Meteoritics, 29, 182).



Thin Section Images

Cross-Polarized LightPlane-Polarized Light
RBT 04239 - Cross-Polarized Light RBT 04239 - Plane-Polarized Light



Lab Images

RBT 04239 Image North

Data from:
  MB92
  Table 3
  Line 1135:
Mass (g):12
Class:Achon-ung
Weathering grade:C
Fayalite (mol%):24
Ferrosilite (mol%):20
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:
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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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