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El Tiro
Basic information Name: El Tiro
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2013
Country: Mexico
Mass:help 2.44 kg
Meteoritical Bulletin:  MB 104  (2015)  L3
Recommended:  L3    [explanation]

This is 1 of 824 approved meteorites (plus 1 unapproved name) classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 1 Nov 2015
Writeup from MB 104:

El Tiro        30.279230°N, 111.817131°W

Sonora, Mexico

Find: Jan 2013

Classification: Ordinary chondrite (L3)

History: A single stone showing weathering cracks, some remnant fusion crust, and shallow regmaglypts was found by a gold prospector close to the settlement of El Tiro in Sonora, Mexico.

Physical characteristics: Single stone. A saw cut and polished slices reveal many densely packed chondrules of variable size set in a dark brown groundmass. This meteorite also contains breccia clasts and fragments up to ~1 cm in size.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous unequilibrated chondrules, apparent mean diameter many with porphyritic, igneously zoned olivines and pyroxenes. Some scattered, opaque, fine-grained matrix is present. A few high-Ca pyroxenes were observed. Only small amounts of very fine-grained plagioclase were observed.

Geochemistry: (C. Agee and N. Muttik, UNM) Chondrule olivine Fa21.4±8.8, Fe/Mn=65±26, Cr2O3=0.06±0.05 wt%, n=10, chondrule low-Ca pyroxene Fs20.4±1.0Wo2.0±1.2, Fe/Mn=29±2, n=7.

Classification: Ordinary chondrite L3, estimated type 3.4-3.6 based on mean values and 1-sigma of Fa and Cr2O3-content of ferroan olivines.

Specimens: 23.1 g including a probe mount on deposit at UNM, Aerolite Meteorites holds the main mass.

Data from:
  Table 0
  Line 0:
Date:Jan 2013
Mass (g):2442.6
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):21.4±8.8
Ferrosilite (mol%):20.4±1.0
Wollastonite (mol%):2.0±1.2
Classifier:C. Agee, UNM
Type spec mass (g):23.1
Type spec location:UNM
Main mass:Aerolite Meteorites Inc.
Comments:GN-2; submitted by C. Agee
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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::   (30° 16' 45"N, 111° 49' 2"W)

     This is 1 of 9 approved meteorites from Sonora, Mexico
     This is 1 of 113 approved meteorites from Mexico (plus 4 unapproved names) (plus 1 impact crater)
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