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Mesa La Caguama
Basic information Name: Mesa La Caguama
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1971
Country: Mexico
Mass:help 6.9 kg
Meteoritical Bulletin:  MB 105  (2016)  Iron, IAB-MG
Recommended:  Iron, IAB-MG    [explanation]

This is 1 of 120 approved meteorites classified as Iron, IAB-MG.   [show all]
Search for other: IAB complex irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 27 Jun 2016
Writeup from MB 105:

Mesa La Caguama        27°35’N, 113°4’W

Baja California Sur, Mexico

Find: 1971

Classification: Iron meteorite (IAB-MG)

History: An "extremely heavy rock" was found by Francisco Arce Arce in 1971. It was discovered along a burro trail between Rancho San Gregorio and the dirt road that leads to Rancho San Francisco, off the paved road to San Ignacio. Noting the unusual density of the rock, Mr. Arce Arce believed that it might be something special. In 1991, Richard and Alice Gross were revisiting the area after an earlier tour, were shown the object, and, on a later trip in 2003, brought it to the US in the hope of confirming its extraterrestrial nature, and to sell it on behalf of Mr. Arce Arce. The specimen was brought to Michael Blood, who brokered the sale of the iron to the Utas Meteorite Collection.

Physical characteristics: The meteorite weighed 6897 g when found. The flattened, irregular mass is differentially weathered due to its position in the ground: one side of the iron is relatively smooth, while the other exhibits numerous larger, more sharply defined regmaglypts. Several of the promontories show crude saw and hammer marks: evidence of failed attempts to remove samples. Two ~1-2 cm. sulfide inclusions are visible on the surface of the iron.

Petrography: (J.T. Wasson, UCLA) Relatively fresh iron. Few inclusions; one phosphide 1.5 × 0.2 mm, a few smaller ones. Kamacite bandwidth is 1.8±0.3 mm, thus Og. A 1-2 mm-thick heat-altered rim is visible along one edge of the cut face.

Geochemistry: Composition: 4.59 mg/g Co, 68.6 mg/g Ni, 94.3 μg/g Ga, 473 μg/g Ge, 10.3 μg/g As, 2.16 μg/g Ir, and 1.431 μg/g Au. Based on the composition and structure, this a member of the IAB main group. It falls near the low-Au end of the group. Its nearest relatives are Allan Hills 76002, Cosby's Creek, Morasko, and New Leipzig, but it is compositionally resolved from all of these.

Classification: Iron, IAB-MG

Specimens: Only one specimen known.

Data from:
  Table 0
  Line 0:
State/Prov/County:Baja California Sur
Mass (g):6897
Class:Iron, IAB-MG
Classifier:J. T. Wasson, UCLA
Type spec mass (g):38.6
Type spec location:UCLA
Main mass:Utas
Finder:Francisco Arce Arce
Comments:Submitted by J. T. Wasson
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
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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     Recommended::   (27° 35'N, 113° 4'W)

     This is 1 of 4 approved meteorites from Baja California Sur, Mexico
     This is 1 of 113 approved meteorites from Mexico (plus 4 unapproved names) (plus 1 impact crater)
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