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Yucca 045 | |||||||||||||||||||||||||||||||||||||
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Basic information | Name: Yucca 045 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 77 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 Apr 2018 | ||||||||||||||||||||||||||||||||||||
Writeup![]() |
Writeup from MB 107:
Yucca 045 34°45.894’N, 114°14.101’W Arizona, United States Find: 27 Mar 2011 Classification: Ordinary chondrite (H3-6) History: Found with metal detector 6 inches below the surface in the Yucca DCA by Jim Wooddell March 27, 2011. Entire stone donated to Cascadia. Physical characteristics: Exterior is covered with weathered fusion crust, with large patches of reddish-brown rust. Petrography: In thin section, two distinct lithologies that appear lighter and darker in plane-polarized light are visible and have irregular and gradational boundaries. The light lithology is coarser grained and contains chondrules with boundaries integrated into their surroundings. Feldspar is variable in size, most slightly below 50 µm in diameter, but with a few larger grains. The dark lithology is dominated by fragmental material containing numerous small cryptocrystalline chondrules; BSE imaging shows that this lithology contains a mix of equilibrated silicates, with a fairly large (~25-35 area %) admixture of type 3 material (both magnesian and iron-rich olivine and pyroxene grains). This lithology also contains occasional coarse feldspar grains (most below 50 µm in diameter), coarse phosphate grains, and numerous chromite-plagioclase assemblages. FeNi carbide with some accompanying magnetite, alumnious low-calcium and high-calcium pyroxenes, and silica polymorph are present in the dark lithology. Along two edges of the section abutting the dark lithology is a small patch of shock melt (opaque in plane-polarized light) containing metal and troilite blebs, and a coarse-grained clast lacking chondrules. Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Light lithology olivine (Fa19.6±0.6, N=7) and low-Ca pyroxene (Fs17.6±0.9Wo1.3±0.2, N=5) are consistent with a type 5 or 6 designation. Dark lithology olivine (Fa17.7±9.2, N=35) and low-Ca pyroxene (Fs15.4±6.5Wo1.2±1.0, N= 33) compositions reflect the large admixture of type 3 material. Fragments in this lithology include a partial chondrule containing dusty forsteritic olivine grains (Fa0.7±4.0) and aluminum-rich diopside (6 wt% Al2O3) set in anorthitic glass (An92Or0), as well as a fragment of a ferroan chondrule with olivine (Fa34-51) and low-Ca pyroxene (Fs24 Wo5) set in a Na-K-rich glass. The coarse-grained clast at the edge of the section consists of equilibrated olivine (Fa19.3±0.3, N=10), low-Ca pyroxene (Fs16.9±0.2Wo1.5±0.4, N=9), and feldspar (Ab78.2±1.4An14.4±0.7Or7.4±0.8, N=2). Classification: H3-6 finely intermixed genomict breccia. Light lithology is type 5-6 material as implied by medium to coarse feldspar grain sizes and equilibrated olivine and pyroxene; dark lithology contains type 3 material as implied by common presence of magnesian and zoned olivine. Paired with Buck Mountain Wash (synonymous with Yucca 002) on the basis of mineralogy, mineral chemistry, and texture. Specimens: Cascadia holds 38.0 g in two pieces, in addition to one polished thin section and a mounted butt. | ||||||||||||||||||||||||||||||||||||
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: |