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| Dry Creek | |||||||||||||||||||||||||||||||||||||||
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| Basic information | Name: Dry Creek This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2018 Country: United States Mass:  5 kg | ||||||||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 12057 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 16 Feb 2019 | ||||||||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 108:
Dry Creek 44°02.523’N, 101°55.491’W South Dakota, United States Find: Aug 2018 Classification: Ordinary chondrite (H5) History: In August 2018, Lloyd Griswold found a single 5 kg stone in a hay field on his property in Haakon County, South Dakota, approximately 8.5 km north of Cottonwood. Physical characteristics: Exterior of type specimen has weathered brown-black fusion crust, with glossy patches. A broken surface is covered with whitish caliche. Two cut faces are visible: the surfaces of both are reddish brown. Only the larger cut face has remnant patches of metal visible. A thin section was created from one of these metal-containing remnant patches. Petrography: (M. Hutson, A. Ruzicka, Cascadia) In thin section approximately 70% of the opaque minerals have been replaced by iron hydroxide weathering products. This material is opaque in transmitted light and both surrounds and crosscuts chondrules, chondrule fragments, and individual mineral grains. Plagioclase feldspar grains observed in BSE images are typically 20-25 μm across, with two grains up to 50 μm across. Geochemistry: Mineral compositions and geochemistry: Olivine (Fa19.5±0.2, N=14), low-Ca pyroxene (Fs17.4±0.2Wo1.5±0.2, N=12). Classification: H5 based on iron contents in olivine and pyroxene and size of plagioclase feldspar grains. Specimens: Cascadia holds 179.4 g in six pieces, in addition to a polished thin section and a mounted butt. | ||||||||||||||||||||||||||||||||||||||
| Data from: MB108 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. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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Geography:
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Statistics: This is 1 of 19 approved meteorites from South Dakota, United States This is 1 of 1935 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters) | ||||||||||||||||||||||||||||||||||||||
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