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| San Juan 089 | |||||||||||||||||||||||||||||||||||||
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| Basic information | Name: San Juan 089 This is an OFFICIAL meteorite name. Abbreviation: SJ 089 Observed fall: No Year found: 2017 Country: Chile Mass:  78 g | ||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 12099 approved meteorites (plus 23 unapproved names) classified as H5. [show all] Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7) | ||||||||||||||||||||||||||||||||||||
| Comments: | Approved 15 Sep 2018 | ||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 107:
San Juan 089 (SJ 089) 25°26.488’S, 69°53.232’W Antofagasta, Chile Find: 18 Jan 2017 Classification: Ordinary chondrite (H5) History: Charles and Nick Lucas used low-grade magnets attached to poles, while walking north-south lines about 5 mapart in the area where the meteorite was found, which is a relatively flat area with a 2 to 3 degree down slope to the north. Physical characteristics: Dark-brown weathering patina covers entire exterior. Patches of beige caliche occur on top of the patina on one side of the samples Petrography: The overall texture is fairly well integrated in thin section, although chondrules are readily identifiable. Chondrule mesostases are fine grained and include devitrified glass. Numerous chromite-plagioclase regions and several grains of metallic copper are present. BSE imaging shows that olivine and low-calcium pyroxene grains are coarse and equilibrated. Both chondrule mesostases and chromite-plagioclase objects extend into feldspathic veins which invade surrounding ferromagnesian. Feldspathic mesostases experienced segregation of sodic, potassic, and calcic components and display different gray levels in BSE images. Tiny chromite grains are concentrated in albitic patches in mesostases. One barred olivine chondrule was examined in detail. It contained a potassium feldspar grain adjacent to a grain with a perthitic intergrowth of albite and orthoclase. In the same chondrule were regions of chromite-albitic plagioclase intergrowths and small patches of calcic feldspathic glass. Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Olivine (Fa19.9±0.5, N=34) and low-Ca pyroxene (Fs17.8±0.7Wo1.3±0.2, N=27) grains are equilibrated. Feldspathic material occurs in three roughly defined compositions (sodic Ab79.8An15.0Or5.2, N=13; calcic Ab26.4An73.2Or0.4, N=4; potassic Ab10.6An4.2Or85.2, N=5). Classification: H5 based on chemistry and texture. Specimens: Cascadia holds 17.3 g in three pieces, in addition to one polished thin section and a mounted butt. | ||||||||||||||||||||||||||||||||||||
| 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) |
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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 3671 approved meteorites from Antofagasta, Chile (plus 12 unapproved names) (plus 1 impact crater) This is 1 of 3700 approved meteorites from Chile (plus 13 unapproved names) (plus 1 impact crater) | ||||||||||||||||||||||||||||||||||||
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