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Wisconsin Range 91600
Basic information Name: Wisconsin Range 91600
     This is an OFFICIAL meteorite name.
Abbreviation: WIS 91600
Observed fall: No
Year found: 1991
Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)]
Mass:help 184.1 g
Antarctic Meteorite Newsletter:  AMN 16(1)  (1993)  C2
Meteoritical Bulletin:  MB 76  (1994)  C2
NHM Catalogue:  5th Edition  (2000)  CM2
MetBase:  v. 7.1  (2006)  C2-ung
Antarctic Meteorite Newsletter:  AMN 33(1)  (2010)  CM2
AMN 41(1)  (2018)  CM-an
Recommended:  CM-an    [explanation]

This is 1 of 9 approved meteorites classified as CM-an.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Revised 3 Jun 2019: reclassified in AMN 41(1)
Writeup from AMN 16(1):

Sample No.: WIS91600; 91608

Location: Wisconsin Range

Dimensions (cm): 6.5 x 6.0 x 5.0; 1 x 0.3 x 0.5

Weight (g): 184.1; 0.3 Meteorite Type: C2 Chondrite


Macroscopic Description: Carol Schwarz Seventy-five percent of these carbonaceous chondrite fragments are covered with black, fractured, and rusty fusion crust. The fusion crust is frothy on 91608. The interior is black with numerous small dark gray chonrules/clasts. A minor amount of evaporite deposit is present on the exterior and interior surfaces of 91600.


Thin Section (91600,2: 91608,2) Description: Brian Mason

These sections are so similar that a single description suffices; the meteorites are probably paired. They show chondrules, up to 1.2 mm in diameter, irregular aggregates, and mineral grains, in a black carbonaceous matrix. The minerals are mainly olivine, with minor pyroxene. Olivine compositions are mostly near Mg2SiO4, but occasional iron-rich grains were analyzed, up to Fa44. Pyroxene compositions range from Fs1, to Fs15. The meteorites are C2 chondrites.


Writeup from AMN 33(1):
WIS 91600 originally classified as a C2 chondrite. Oxygen isotope data [1] and bulk compositional data [2] indicate this meteorite has a bulk composition like CM, but has seen extensive hydration like Belgica 7904. [1] Clayton R. N. and Mayeda T. K. 2003. Oxygen isotopes in carbonaceous chondrites (abstract). International Symposium on the Evolution of Solar System Materials: A New perspective from Antarctic Meteorites. National Institute of Polar Research, Tokyo, Japan, 13-14. [2] Moriarty, G. et al. (2009) Compositions of four unusual CM or CM-related Antarctic chondrites. Chemie der Erde – Geochemistry 69, 161-168.

Writeup from AMN 41(1):
WIS 91600: reclassification

Listed by Choe et al. (2010) as CM-anomalous
  • Choe W. H., Huber H., Rubin A.E., Kallemeyn G. W., and Wasson J. T. (2010) Compositions and taxonomy of 15 unusual carbonaceous chondrites. Meteorit. Planet. Sci. 45, 531-554 (link)
Data from:
  Table 2
  Line 5510:
Origin or pseudonym:Spear Nunatak
Mass (g):184.1
Weathering grade:A/Be
Fayalite (mol%):1-39
Ferrosilite (mol%):1-15
Comments:91600 pairing group
Search for specimens in the Smithsonian Institution collection (U.S.):   
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Search for this meteorite in the NASA/JSC database (U.S.):   
References: Published in Antarctic Meteorite Newsletter 16(1) (1993), JSC, Houston
Published in Antarctic Meteorite Newsletter 33(1) (2010), JSC, Houston
Published in Antarctic Meteorite Newsletter 41(1) (2018), JSC, Houston
Published in Meteoritical Bulletin, no. 76, Meteoritics 29, 100-143 (1994)
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     Catalogue of Meteorites:   (84° 45'S, 125° 0'W)
     Recommended::   (86° 32' 16"S, 124° 12' 56"W)
Note: the NHM and MetBase coordinates are 199.8 km apart

     This is 1 of 43331 approved meteorites from Antarctica (plus 3802 unapproved names)
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