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Basic information Name: Apizaco
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1961
Country: Mexico
Mass:help 38 kg
Meteoritical Bulletin:  MB 104  (2015)  Iron, IIIAB
Recommended:  Iron, IIIAB    [explanation]

This is 1 of 309 approved meteorites classified as Iron, IIIAB.   [show all]
Search for other: IIIAB irons, Iron meteorites, and Metal-rich meteorites
Comments: Approved 22 Feb 2015
Writeup from MB 104:

Apizaco        19.42°N, 98.13°W

Tlaxcala, Mexico

Find: 1961

Classification: Iron meteorite (IIIAB)

History: The meteorite was found by Louis Giraud in about 1961 at the edge of a maize field in the Tlaxcala province of Mexico. Louis and his father Marcel were quail hunting. The exact location is no longer known; they frequently drove from Mexico City to this field and woods region to hunt quail, but the location varied from trip to trip. Apizaco is a small city within about 10 km of the discovery location. The meteorite has been in the possession of Marcel and Louis Giraud since it was found.

Petrography: The meteorite is a medium octahedrite with a bandwidth of ~1.05 mm. It has no heat altered zone and fresh surfaces rust relatively quickly. It has a 0.2 mm oxide filled crack that crosses 80% of the cut face. A low-resolution microscopic study shows a well-preserved structure with no evidence of cosmic reheating. There are numerous small (typically 0.7-1.5 mm) dark plessite fields. No FeS was observed. Schreibersite is rare, but in one region several elongated grains (the largest 0.6-3 mm) are quasi parallel suggesting that this was a region with some trapped melt. Fine (~0.02 mm) schreibersite lamellae are found in rare kamacite intersections.

Geochemistry: Composition: Co, 5.25 mg/g; Ni, 85.5 mg/g; Ga, 21.4 μg/g; Ge,<60 μg/g; As, 9.35 μg/g Ir, 0.322 μg/g; and Au, 1.174 μg/g.

Classification: The meteorite is a normal member of group IIIAB.

Specimens: The nearest compositional relatives are Seneca Falls (New York) and Sierra Sandon (Chile) which are obviously not part of the same fall event. The Mexican meteorite Asarco Mexicana, for which geographic coordinates are not known, has 15% lower As and Ir contents and 10% lower Au content and is very unlikely to be part of the same fall.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:Nearby field and woods
Mass (g):38000
Class:Iron, IIIAB
Weathering grade:moderate
Classifier:J.T. Wasson, UCLA
Type spec mass (g):132
Type spec location:UCLA
Main mass:Louis Giraud
Finder:Louis Giraud
Comments:Latitude and longitude accurate to ±0.1°; 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. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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     Recommended::   (19° 25' 12"N, 98° 7' 48"W)

     This is 1 of 2 approved meteorites from Tlaxcala, Mexico
     This is 1 of 111 approved meteorites from Mexico (plus 4 unapproved names) (plus 1 impact crater)
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