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Miller Range 090292
Basic information Name: Miller Range 090292
     This is an OFFICIAL meteorite name.
Abbreviation: MIL 090292
Observed fall: No
Year found: 2009
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 8.9 g
Classification
  history:
Antarctic Meteorite Newsletter:  AMN 35(2)  (2012)  CR1
Meteoritical Bulletin:  MB 101  (2012)  CR1
Antarctic Meteorite Newsletter:  AMN 42(1)  (2019)  C1-ung
Recommended:  C1-ung    [explanation]

This is 1 of 2 approved meteorites classified as C1-ung.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 1), and Ungrouped chondrites
Comments: Field number: 20597
Approved 4 Sep 2012
Revised 21 Feb 2019: Reclassified in AMN 42(1)
Writeuphelp
Writeup from AMN 35(2):
Sample Number MIL 090292
Newsletter 35,2
Location Miller Range
Field Number 20597
Dimensions 2.5 x 2.0 x 1.5
Weight 8.94
Original Classification CR1 Chondrite
Mineral Composition (%Fa &  %Fs)
Fayalite (mol%): 3; Ferrosilite (mol%): 2-39
Weathering
B
Fracturing
B
Macroscopic Description - Kathleen McBride
90% of the exterior has brown/black fusion crust with polygonal fractures. The interior matrix is black with an oxidation rind and some white inclusions.
Thin Section Description (,2) - Cari Corrigan, Tim McCoy, and Glenn MacPherson
The section is comprised of large (1 mm) chondrules that are almost completely replaced by aqueous alteration products. Opaques include sulfides and metal (?) that have been extensively altered. Rare magnesian mafic silicates of Fa3, Fs2-39 are found mostly within chondrules. The meteorite appears to be a type 1 carbonaceous chondrite, likely a CR, although a relationship to CV chondrites is possible.
Antarctic Meteorite Images for Sample MIL 090292
Lab Group Photo of Sample MIL 090292 Showing North View  Thin Section Photo of Sample MIL 090292 in Plane-Polarized Light with 1.25X Magnification  Thin Section Photo of Sample MIL 090292 in Reflected Light with 1.25X Magnification  Thin Section Photo of Sample MIL 090292 in Cross-Polarized Light with 1.25X Magnification 
Thin Section Photo of Sample MIL 090292 in Plane-Polarized Light with 2.5X Magnification  Thin Section Photo of Sample MIL 090292 in Reflected Light with 2.5X Magnification  Thin Section Photo of Sample MIL 090292 in Cross-Polarized Light with 2.5X Magnification 

Writeup from AMN 42(1):
Reclassification of MIL 090292

MIL 090292 was announced as a CR1 chondrite in the August 2012 newsletter 35(2). Subsequent studies have suggested it might be a CR2 (Harju et al., 2014), and other work has highlighted the fact that it has distinct mineralogy from CR chondrites (Ni-rich metal and cubanite, while also lacking carbonate), and has O isotopic compositions offset from the trend of CR chondrites (Jilly-Rehak et al., 2018; Schrader et al., 2014). For these reasons, and because it is a small and potentially rare meteorite, we have decided to reclassify this sample as an ungrouped C1 chondrite.
Bibliography:
  • Antarctic Meteorite Newsletter 35(2) (2012), JSC, Houston (link)
  • Harju, E.R., Rubin, A.E., Ahn, I., Choi, B.-G., Ziegler, K., Wasson, J.T. (2014) Progressive aqueous alteration of CR carbonaceous chondrites. Geochim. Cosmochim. Acta 139, 267-292. (link)
  • Jilly-Rehak, C.E., Huss, G.R., Nagashima, K., and Schrader, D.L. (2018) Low-temperature aqueous alteration on the CR chondrite parent body: Implications from in situ oxygen-isotope analyses. Geochim. Cosmochim. Acta 222, 230-252. (link)
  • Schrader, D.L., Davidson, J., Greenwood, R.C., Franchi, I.A., Gibson, J.M. (2014) A water-ice rich minor body from the early Solar System: The CR chondrite parent asteroid. Earth Planet. Sci. Letts. 407, 48-60. (link)
Data from:
  MB101
  Table 0
  Line 0:
Date:2009
Mass (g):8.9
Pieces:1
Class:CR1
Weathering grade:B
Fayalite (mol%):3
Ferrosilite (mol%):2-39
Classifier:SI
Type spec mass (g):8.9
Type spec location:JSC
Main mass:JSC
Finder:ANSMET
Comments:Submitted by AMN
Institutions
   and collections
JSC: Mailcode KT, 2101 NASA Parkway, NASA Johnson Space Center, Houston, TX 77058, United States; Website (institutional address; updated 3 Sep 2013)
SI: Department of Mineral Sciences, NHB-119, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, United States; Website (institutional address; updated 16 Jan 2012)
Catalogs:
Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 35(2) (2012), JSC, Houston
Published in Antarctic Meteorite Newsletter 42(1) (2019), JSC, Houston
Published in Meteoritical Bulletin, no. 101, MAPS 50, 1661, September 2015
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Geography:

Antarctica
Coordinates:
     Recommended::   (83° 22' 3"S, 156° 28' 19"E)

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