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La Garita
Basic information Name: La Garita
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2006
Country: United States
Mass:help 1387 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Iron, ungrouped
Recommended:  Iron, ungrouped    [explanation]

This is 1 of 129 approved meteorites (plus 1 unapproved name) classified as Iron, ungrouped.   [show all]
Search for other: Iron meteorites, Metal-rich meteorites, and Ungrouped irons
Comments: Approved 17 Dec 2016
Writeuphelp
Writeup from MB 105:

La Garita        37°56’N, 106°12’W

Colorado, United States

Find: 2006

Classification: Iron meteorite (ungrouped)

History: A single mass of 1387 g was found on an alluvial fan, 6.7 miles northeast of the town of La Garita, Saguache County, Colorado. In 2006, Mr. Robert Garcia was hunting for projectile points on his relative’s property when he noticed what appeared to be a "cannon ball fragment" lying in the dirt. He picked it up and thought it may be a meteorite after researching them on the internet.

Physical characteristics: The specimen is dome-shaped with a subtle rollover lip and measures 13 × 9 cm across and ~3 cm thick. It has a mostly dark brown-black exterior with a few cm-scale regmaglypts, and red-brown staining in spots.

Petrography: Optical investigation reveals a well-developed Widmanstatten pattern consistent with a fine octahedrite. Troilite inclusions are common.

Geochemistry: Bulk composition: ICP-MS data, using sample of North Chile (Filomena) as standard (C. Herd and G. Chen, UAb): Ni = 12.1, Co = 0.45 (both wt%); Ir = 0.76, Ga = 30, Ge = 117, W = 1.0, Re = 0.11, Cu = 682, Ru = 5.3, Pd = 5.3, Pt = 6.7 (all μg/g).

Classification: (C. Herd, UAb): Ungrouped iron, fine octahedrite. Concentrations of Ni, Ir and Ga appear to be consistent with the IAB group, possibly related to the sLM subgroup of Wasson and Kallemeyn (2002); however, Ge, Pt, Cu and W are anomalously high for the sLM subgroup. Au could not be reliably determined. Classified as ungrouped based on the bulk composition, as well as the lack of silicate inclusions which are typical of IAB iron meteorites.

Specimens: Type specimen of 21.1 g at UAb. Main mass with M. Morgan.

Bibliography:
  • Wasson J.T. and Kallemeyn, G.W. (2002) The IAB iron-meteorite complex: A group, five subgroups, numerous grouplets, closely related, mainly formed by crystal segregation in rapidly cooling melts. Geochim. Cosmochim. Acta 66 2445-2473 (link)
Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Colorado
Origin or pseudonym:alluvial fan
Date:2006
Latitude:37°56'N
Longitude:106°12'W
Mass (g):1387
Pieces:1
Class:Iron, ungrouped
Shock stage:low
Weathering grade:low
Classifier:C. Herd, UAb
Type spec mass (g):21.1
Type spec location:UAb
Main mass:M. Morgan
Finder:R. Garcia
Comments:Submitted by C. Herd
Institutions
   and collections
UAb: 1-26 Earth Sciences Building, University of Alberta, Edmonton, AB, T6G 2E3, Canada, Canada; Website (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography:

United States
Coordinates:
     Recommended::   (37° 56'N, 106° 12'W)

Statistics:
     This is 1 of 89 approved meteorites from Colorado, United States (plus 5 unapproved names)
     This is 1 of 1835 approved meteorites from United States (plus 358 unapproved names) (plus 28 impact craters)
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