Meteoritical Bulletin: Entry for Roberts Massif 04239

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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: 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 151 approved meteorites classified as Achondrite-ung. [show all]
Search for other: Achondrites, Ungrouped achondrites

Comments:

Approved 1 Sep 2006

Writeup

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 Light	Plane-Polarized Light

Lab Images

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)

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Photos:

Credit	Photos
Photographs from AMN:
JSC	A photo is in the write-up above

Geography:

Antarctica

Coordinates:

Unknown.

Statistics:
This is 1 of 44543 approved meteorites from Antarctica (plus 3802 unapproved names)

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history:

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