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Yucca 050 | |||||||||||||||||||||||||||||||||||||
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Basic information | Name: Yucca 050 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2011 Country: United States Mass: ![]() | ||||||||||||||||||||||||||||||||||||
Classification history: |
This is 1 of 85 approved meteorites classified as H3-5. [show all] Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||||||||
Comments: | Approved 7 Apr 2018 | ||||||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 107:
Yucca 050 34°48.036’N, 114°15.346’W Arizona, United States Find: 25 Nov 2011 Classification: Ordinary chondrite (H3-5) History: Found by Wendy Wooddell on November 25, 2011 Physical characteristics: Sample has weathered fusion crust on one side. All other exterior faces are broken surfaces which are medium-brown from weathering, showing numerous small protruding dark bumps, which appear to represent weathered metal grains Petrography: In thin section, the sample appears to be relatively integrated, with many chondrule fragments and only a few complete chondrules present; distinct lithic clasts typical of a breccia are absent. The material between chondrule fragments is comprised of individual grains and smaller fragments. BSE imaging shows that most of meteorite consists of fragmental material, with about a 10% admixture of magnesian and iron-rich olivine and pyroxene grains, many of which show zoning, and which abut equilibrated fragments with typical H-chondrite compositions. Numerous chromite-plagioclase objects were observed, including a fragment containing chromite-plagioclase pseudomorphs after a lath-shaped phase set in a feldspathic matrix. Throughout the section, feldspathic material consists of glass of variable compositions and crystalline plagioclase feldspar grains typically 20-40 µm across; a few grains up to 70 µm across were observed. Also present are merrillite grains, some up to 250 µm across. Fe-Ni carbide was found, along with ilmenite and magnetite. Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Sample contains a range of compositions of olivine (Fa18.7±2.2, N=31) and low-Ca pyroxene (Fs15.2±3.6Wo1.6±0.8, N= 44). Classification: Meteorite is an H-chondrite, based on chemistry. Although the chemistry and abundance of zoned grains suggests a type 3 designation, the presence of medium-sized crystalline feldspar, coarse phosphate, and chromite-plagioclase objects suggests a higher petrographic type. The thin section studied strongly resembles the "main" lithology found in the Buck Mountain Wash chondrite, which is an H3-5 finely intermixed genomict breccia. Paired with Buck Mountain Wash (synonymous with Yucca 002) on the basis of mineralogy, mineral chemistry, and texture. Specimens: Cascadia holds 23.4 g in one piece, in addition to three polished thin sections. Wendy Wooddell retained a 3.8 g end piece. | ||||||||||||||||||||||||||||||||||||
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:![]() |
Statistics: This is 1 of 178 approved meteorites from Arizona, United States (plus 1 impact crater) This is 1 of 1919 approved meteorites from United States (plus 867 unapproved names) (plus 28 impact craters) | ||||||||||||||||||||||||||||||||||||
Proximity search: |