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| Yucca 043 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Yucca 043 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2004 Country: United States Mass:  535 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 80 approved meteorites classified as H3-6. [show all] Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3) | ||||||||||||||||||||||||||||||||
| Comments: | Approved 7 Jul 2016 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 105:
Yucca 043 34°46.043’N, 114°13.350’W Arizona, United States Find: 2 March 2004 Classification: Ordinary chondrite (H3-6) History: Sample was found as 7 nearby pieces that were glued together by finder to form a single stone, but which fell apart during cutting. Petrography: In thin section, the sample appears to be relatively integrated, with a texture resembling a type 5 chondrite comprised primarily of chondrule fragments. Smaller chondrule and mineral fragments occur between the larger fragments. With the exception of a large (~1.5 mm across) angular feldspathic cryptocrystalline clast, lithic clasts are absent. BSE imaging shows that most of the meteorite contains equilibrated silicate, but that there is a substantial (~10 area %) admixture of type 3 material (both magnesian and iron-rich zoned olivine and pyroxene grains). Most of the equilibrated material contains devitrified glass or small (< 50 μm) plagioclase feldspar grains; coarse (>50 μm) plagioclase is also present. A particularly large (90 × 475 μm) plagioclase feldspar grain was observed adjacent to the cryptocrystalline pocket. Clinoenstatite, silica polymorph, chlor-apatite, merrillite, chromite-plagioclase objects, metallic copper, and an Fe-Ni carbide phase were observed. Notable is one roughly rectangular (100 × 250 μm) chromite-plagioclase intergrowth surrounded by successive bands of chromite, plagioclase feldspar, high-calcium pyroxene, and phosphate. Additionally, one high-Ca pyroxene grain has elevated alumina, similar to aluminous pyroxene grains reported for Buck Mountain Wash. Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Representative analyses for fragments and chondrule (includes both equilibrated and unequilibrated grains): olivine (Fa18.9±4.0, N=112), low-Ca pyroxene (Fs17.0±4.5Wo1.3±0.7, N= 98). Classification: Meteorite represents an intimate mixture of fragmental material. Type 3 is inferred from presence of zoned magnesian and ferroan olivine grains; type 6 from coarse (>50 μm) plagioclase feldspar grains. It is classified as an H3-6 genomict breccia. Paired with Buck Mountain Wash (Yucca 002). Specimens: Cascadia holds 65.8 g in multiple pieces, in addition to one polished thin section and a mounted butt. | ||||||||||||||||||||||||||||||||
| Data from: MB105 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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| References: | Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
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Geography:
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Statistics: This is 1 of 181 approved meteorites from Arizona, United States (plus 1 impact crater) This is 1 of 1935 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters) | ||||||||||||||||||||||||||||||||
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