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| Yucca 041 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Yucca 041 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2005 Country: United States Mass:  48.5 g | ||||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 76 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 27 Feb 2016 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 105:
Yucca 041 34°42.05’N, 114°17.3’W Arizona, United States Find: 2005 Sep Classification: Ordinary chondrite (H3-6) History: Found by Dennis Asher. Jerry A. Baird donated the entire stone to Cascadia. Physical characteristics: Most of sample has a broken surface covered with weathering patina and dust. Fusion crust occurs on one small area. Petrography: In thin section composed mostly of an intimate mixture of mineral and chondrule fragments with diverse (type 3-6) characteristics. BSE imaging shows that most of the rock is composed of type 4-6 lithologies, with equilibrated olivine, and plagioclase up to 50 μm and sometimes >100 μm across, but that some zoned or magnesian or ferroan olivine and pyroxene grains characteristic of type 3 are present. This resembles the fragmental (main) lithology of Buck Mountain Wash. Shock effects in olivine are variable (weak undulose extinction to strong mosaicism), with ?25% of the olivine grains showing mosaic extinction with multiple sets of planar fractures indicating a shock stage of S4. Metal and sulfide grains show minor weathering (~5% replacement by Fe-hydroxides). Contains a band of shock melt with zoned olivine crystals set in glass, and silica polymorph. Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Dominated by equilibrated olivine (median Fa18.5, N=127) and low-Ca pyroxene (median Fs12.1, N=129), but also containing more magnesian and ferroan olivine (Fa6.5-30.3) and low-Ca pyroxene (Fs0.9-37.8). Overall average including both equilibrated and more varied compositions in the mixture is olivine (Fa16.7±6.5, N=127), low-Ca pyroxene (Fs11.3±7.8Wo1.2±1.3En87.6±8.4, N= 129). Classification: H3-6 finely intermixed genomict breccia. Type 5-6 lithology implied by larger feldspar grain sizes and equilibrated olivine and pyroxene; type 3 lithology implied by common presence of magnesian and zoned olivine and pyroxene. Paired with Buck Mountain Wash on the basis of mineralogy, mineral chemistry, and texture. Specimens: Cascadia holds 41.4 g in single piece, in addition to two polished thin sections 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 178 approved meteorites from Arizona, United States (plus 1 impact crater) This is 1 of 1894 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters) | ||||||||||||||||||||||||||||||||
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