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Roberts Massif 04255
Basic information Name: Roberts Massif 04255
     This is an OFFICIAL meteorite name.
Abbreviation: RBT 04255
Observed fall: No
Year found: 2004
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 10.2 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 30(2)  (2007)  Achondrite-ung
Recommended:  Achondrite-ung    [explanation]

This is 1 of 151 approved meteorites classified as Achondrite-ung.   [show all]
Search for other: Achondrites, Ungrouped achondrites
Comments: Approved 31 Aug 2007
Writeuphelp
Writeup from AMN 30(2):
Sample No.: RBT 04255
Location: Roberts Massif
Field No.: 16342
Dimensions (cm):   2.5 x 2.0 x 1.0
Weight (g): 10.170
Meteorite Type:

Achondrite Ungrouped



Macroscopic Description: Kathleen McBride
90% thick brown/black fusion crust covers the exterior surface. The interior is a rusty black matrix with metal and is hard.

Thin Section (,2) Description: Tim McCoy, Lauren LaCroix and Linda Welzenbach
The meteorite is paired with RBT 04239, which was described as follows: 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

Plane-Polarized
Light RBT 04255		 Cross Polarized Light
RBT 04255
RBT04255 - Plane-Polarized Light RBT04255 - Cross Polarized Light



Lab Images

RBT 04255

Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 30(2) (2007), JSC, Houston
Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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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 44547 approved meteorites from Antarctica (plus 3802 unapproved names)
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Revision
  history:
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