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Yucca 035
Basic information Name: Yucca 035
     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:help 43.3 g
Meteoritical Bulletin:  MB 105  (2016)  H3-6
Recommended:  H3-6    [explanation]

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 from MB 105:

Yucca 035        34°42.063’N, 114°11.259’W

Arizona, United States

Find: 2005 Oct 9

Classification: Ordinary chondrite (H3-6)

History: Dennis Asher found this stone on October 9, 2005, and later donated it to Cascadia.

Physical characteristics: All surfaces are covered with weathering products, consisting of patches of orange rust, tan clay and pink caliche. No remnant fusion crust is present.

Petrography: In thin section, composed mostly of an intimate mixture of mineral and chondrule fragments with diverse (type 3-6) characteristics; one discrete type 6 clast is also present. BSE imaging shows that most of the rock ("host") is composed of type 4-6 lithologies, with equilibrated olivine, and plagioclase varying from smaller (to 50 µm across) to rarely coarser (>100 μm) grains; the host also contains ~5-10% material characteristic of type 3 including zoned or more magnesian and ferroan olivine grains, feldspathic glass, and magnesian pyroxene. Discrete type 6 clast contains coarse feldspar (50-100 μm grains). Individual grains of a silica polymorph were observed, as well as three grains of low-Ca pyroxene with relatively high (3.4-4.7 wt% Al2O3) alumina content, similar to those reported for Buck Mountain Wash. A number of small chromite-plagioclase objects are present, as are grains of metallic copper. Many fragments and metal and troilite roughly align. Opaques show minor weathering (~5-10% replacement by Fe-hydroxides). Shock effects in olivine are variable across the section, with most grains having undulose extinction and one set of planar fractures, consistent with a shock stage of S3.

Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Host dominated by equilibrated olivine (median Fa18.9, N=127), and low-Ca pyroxene (median Fs15.3, N=86), but also containing more magnesian and ferroan olivine (Fa2.1-51.2) and low-Ca pyroxene (Fs5.7-30.8). Overall average host including mixture of both equilibrated and more varied compositions is olivine (Fa19.6±5.8, N=127), low-Ca pyroxene (Fs13.4±5.7Wo1.3±1.3En85.3±5.8, N= 86). Type 6 clast olivine (Fa19.4±1.3, N=7) and low-Ca pyroxene (Fs17.1±0.5En81.2±1.0Wo1.7±0.6, N=4).

Classification: H3-6 finely intermixed genomict breccia. Type 5-6 lithology implied by larger feldspar grain sizes and abundant equilibrated olivine and pyroxene as well as discrete type 6 chondrite clast; type 3 lithology implied by common presence of magnesian and zoned olivine and feldspathic glass. Paired with Buck Mountain Wash on the basis of mineralogy, mineral chemistry, and texture.

Specimens: Cascadia holds 35.9 g in multiple pieces, in addition to two polished thin sections and a mounted butt.

Data from:
  Table 0
  Line 0:
Date:2005 Oct 9
Mass (g):43.3
Shock stage:S3
Weathering grade:W1
Magnetic suscept.:4.97
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):35.9
Type spec location:Cascadia
Main mass:Cascadia
Finder:Dennis Asher
Comments:Lab number CML0714; field number CML-DA-43.1;; submitted by A. Ruzicka
   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)
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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United States
     Recommended::   (34° 42' 4"N, 114° 11' 16"W)

     This is 1 of 180 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1930 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters)
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