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San Juan de Allende
Basic information Name: San Juan de Allende
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1995
Country: Mexico
Mass:help 200 g
Classification
  history:
Recommended:  L3    [explanation]

This is 1 of 635 approved meteorites classified as L3.   [show all]
Search for other: L chondrites, L chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 17 Jan 2018
Writeuphelp
Writeup from MB 107:

San Juan de Allende        26.94°N, 105.30°W

Chihuahua, Mexico

Find: 1995 Aug

Classification: Ordinary chondrite (L3)

History: An approximately 200 g single invidual was found by Ruben Jurado, sold to Edwin Thompson, with portions donated to Cascadia in 2004 and 2008.

Petrography: Well-defined chondrules, some glass-bearing, with an average diameter of 0.77±0.34 mm (N=59), are present in a chondrite with an estimated metal content of 3.5 area%.

Geochemistry: Chondrules contain unequilibrated olivine (Fa22.1±7.5, N=99) and low-Ca pyroxene (Wo0.9±0.8Fs11.6±8.2, N=52). A subset of olivine point analyses, obtained with longer count times for better minor element data, gives a Cr2O3 content of 0.08±0.08 wt% (N=13).

Classification: L3 chondrite based on mean chondrule size, metal abundance, olivine and pyroxene compositions. Subtype estimated as 3.4-3.6, based on olivine Fa content and Cr2O3 content (latter suggests ~3.2).

Specimens: Type sample at Cascadia consists of four pieces totaling to 20.2 g as well as a polished thin section. A 113 g main mass specimen is held by a person wishing to remain anonymous.

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Chihuahua
Origin or pseudonym:Allende strewnfield
Date:1995 Aug
Latitude:26.94°N
Longitude:105.30°W
Mass (g):200
Pieces:1
Class:L3
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):22.1±7.5
Ferrosilite (mol%):11.6±8.2
Wollastonite (mol%):0.9±0.8
Classifier:K. Farley, M. Hutson, A. Ruzicka, Cascadia
Type spec mass (g):20.2
Type spec location:Cascadia
Main mass:Anonymous holder
Comments:Lab number CML0115. Coordinates are 26.94+-0.03 deg N and 105.30+-0.04 deg W. The errors are +-3.8 km (about 1.8 minutes) latitude and +-5.2 km west (about 2.4 minutes) longitude.; submitted by Alex Ruzicka
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Thompson: Edwin Thompson, 5150 Dawn St., Lake Oswego, OR 97035, United States (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, in preparation (2018)
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Geography:

Mexico
Coordinates:
     Recommended::   (26° 56' 24"N, 105° 18' 0"W)

Statistics:
     This is 1 of 25 approved meteorites from Chihuahua, Mexico (plus 1 unapproved name)
     This is 1 of 109 approved meteorites from Mexico (plus 4 unapproved names) (plus 1 impact crater)
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