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| Yucca 039 | |||||||||||||||||||||||||||||||||
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| Basic information | Name: Yucca 039 This is an OFFICIAL meteorite name. Abbreviation: There is no official abbreviation for this meteorite. Observed fall: No Year found: 2007 Country: United States Mass:  108.6 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 27 Feb 2016 | ||||||||||||||||||||||||||||||||
| Writeup |
Writeup from MB 105:
Yucca 039 34°45.556’N, 114°14.206’W Arizona, United States Find: 28 Feb 2007 Classification: Ordinary chondrite (H3-6) History: Dennis Asher found this stone on Feb. 28, 2007. Physical characteristics: Cut surfaces show abundant metal with minor rust stains. Broken exterior surfaces show caliche. Fusion crust and a weathering rind cover unbroken surfaces. Petrography: In thin section composed 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 grains up to 50 μm and sometimes >50 μm across, but that 10% of the section contains zoned or more magnesian or ferroan olivine and pyroxene characteristic of type 3. This resembles the fragmental (main) lithology of Buck Mountain Wash. Silica polymorph, chromite-plagioclase objects, and metallic copper was observed. Six grains of pyroxene (low- and high-Ca) contain relatively high (4.8-11.9 wt% Al2O3) alumina content, similar to those reported for Buck Mountain Wash. Opaques show minor weathering (~5% replacement by Fe-hydroxides). Shock effects in olivine are variable across the section, with most grains having mosaic extinction and one or more sets of planar fractures, consistent with a shock stage of S4. Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Dominated by equilibrated olivine (median Fa18.7, N=207) and low-Ca pyroxene (median Fs13.0, N=162), but also containing more magnesian and ferroan olivine (Fa5.4-37.2) and pyroxene (Fs0.0-37.3). Overall average including both equilibrated and more varied compositions in the mixture is olivine (Fa19.0±5.4, N=207), low-Ca pyroxene (Fs12.0±6.1Wo1.2±1.1En86.9±6.4, N= 162). 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 23.2 g in one 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 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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