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Vienna
Basic information Name: Vienna
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2009
Country: United States
Mass:help 49.7 kg
Classification
  history:
Recommended:  Iron, IVA    [explanation]

This is 1 of 84 approved meteorites (plus 1 unapproved name) classified as Iron, IVA.   [show all]
Search for other: Iron meteorites, IVA irons, and Metal-rich meteorites
Comments: Approved 9 May 2024
Writeuphelp
Writeup from MB 113:

Vienna        43°15.278’N, 89°26.957’W

Wisconsin, United States

Find: 2009 May 9

Classification: Iron meteorite (IVA)

History: A single mass was found on May 9, 2009, when it was unearthed by a plow during alfalfa planting. A cut sample was sent to FMNH in March 2015, where it was confirmed and classified.

Physical characteristics: This oriented meteorite resembles an irregular pyramid and is well-sculpted with regmaglypts. Flow lines are common on the leading surface and some rollover lipping is present. Although the exterior is oxidized and flaking, this weathering is less than 1 mm deep. The interior is non-oxidized except for some peripheral areas.

Petrography: The Widmanstätten pattern is revealed on a cross-sectioned interior surface after it was polished and etched, with an average bandwidth of 0.27±0.07 mm within the range of IVA irons and fine octahedrites.

Geochemistry: Metal: Kamacite has a mean Ni = 6.7±0.5 wt% (N=21, normalized). Ni concentration in taenite shows an M-shaped profile in the lamellae, with maximum Ni (up to 31 wt%) at kamacite-taenite boundaries with an average of 18.3±6.4 wt% (N=32). Schreibersite is present and has a composition (N=8) of P = 15.3±0.2 wt%, Ni = 38.7±2.3 wt%, Fe=44.9±2.1 wt%. The concentrations of diagnostic trace elements in metal are as follows: Co (4.43 mg/g), Ni (106 mg/g), Cu (157 μg/g), Ga (2.29 μg/g), and Au (2.07 ppm). Ratios of these trace elements are consistent with IVA irons: Co/Ni=~0.042, Ga/Ni=~2.2×10-5, Au/Ni=~1.9×10-5, Cu/Ni=~1.5×10-3, Au/Cu=~0.01, Au/Co=~4.7×10-4. Trace elements measured with LA-ICPMS normalized to NIST 610, and with reference materials North Chile, NIST 610 and 612.

Classification: IVA iron

Data from:
  MB113
  Table 0
  Line 0:
State/Prov/County:Wisconsin
Origin or pseudonym:Vienna EqHo Farm
Date:2009 May 9
Latitude:43°15.278'N
Longitude:89°26.957'W
Mass (g):49700
Pieces:2
Class:Iron, IVA
Classifier:P. Heck, J. Holstein, N. Kita, C. Eaton, R. Slaughter
Type spec mass (g):55
Type spec location:FMNH
Main mass:UWGM
Finder:James C. Koch and Janine M. Shepel
Comments:Submitted by Philipp Heck, Jim Holstein, Noriko Kita, Carrie Eaton, Richard Slaughter
Institutions
   and collections
FMNH: NW Quadrant/Geology The Field Museum of Natural History 1400 South Lake Shore Drive Chicago, IL 60605-2496, USA, United States; Website (institutional address; updated 22 May 2024)
UWGM: University of Wisconsin Geology Museum 1215 West Dayton Street Madison, WI 53706, United States; Website (institutional address; updated 22 May 2024)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
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Geography:

United States
Coordinates:
     Recommended::   (43° 15' 17"N, 89° 26' 57"W)

Statistics:
     This is 1 of 15 approved meteorites from Wisconsin, United States (plus 1 unapproved name) (plus 2 impact craters)
     This is 1 of 1929 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters)
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