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| San Juan de Allende | |||||||||||||||||||||||||||||||||||||
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| 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:  200 g | ||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 811 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 17 Jan 2018 | ||||||||||||||||||||||||||||||||||||
| Writeup |
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: |
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| 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) |
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| Catalogs: |
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| References: | Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
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Geography:
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Statistics: This is 1 of 25 approved meteorites from Chihuahua, Mexico (plus 1 unapproved name) This is 1 of 113 approved meteorites from Mexico (plus 4 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||
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