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Yucca 037
Basic information Name: Yucca 037
     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 69.4 g
Meteoritical Bulletin:  MB 105  (2016)  H3-6
Recommended:  H3-6    [explanation]

This is 1 of 74 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 037        34°44.135’N, 114°13.992’W

Arizona, United States

Find: 2005 Oct 9

Classification: Ordinary chondrite (H3-6)

History: Found Dennis Asher, who donated the stone to Cascadia.

Physical characteristics: Dark brown weathering patina with incorporated beige sand grains covers all exterior surfaces. Weathered fusion crust is visible on two 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 commonly ? 50 μm across, but that ~5-10% 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. Along one edge of the section, material with coarse feldspar and equilibrated olivine and pyroxene grades seamlessly (with no hint of a clast boundary) into a fragmental lithology with zoned olivine and magnesian olivine and pyroxene grains. Free copper was observed, along with several chromite-plagioclase intergrowths. Weathering grade is minimal (W1) with ~5-10% of the being replaced by hydroxide weathering product. Olivine shows undulose to slight mosaic extinction with planar fractures, indicative of shock stage of S3.

Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Dominated by equilibrated olivine (median Fa18.5, N=63) and low-Ca pyroxene (median Fs16.1, N=62), but also containing more magnesian and ferroan olivine (Fa5.0-34.2) and pyroxene (Fs3.8-19.2). Overall average including both equilibrated and more varied compositions in mixture is olivine (Fa17.4±5.0, N=63), low-Ca pyroxene (Fs15.0±3.8Wo1.1±0.9En83.9±4.0, N= 62).

Classification: H3-6 finely intermixed genomict breccia. Type 5-6 lithology implied by larger feldspar grain sizes and abundant equilibrated olivine and pyroxene; type 3 lithology implied by common presence of magnesian and zoned olivine and pyroxene. Possibly paired with Buck Mountain Wash.

Specimens: Cascadia holds 64.9 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):69.4
Shock stage:S3
Weathering grade:W1
Magnetic suscept.:5.17
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):64.9
Type spec location:Cascadia
Main mass:Cascadia
Finder:Dennis Asher
Comments:Lab number CML0716; Field number DA-011;; 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° 44' 8"N, 114° 14' 0"W)

     This is 1 of 169 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1866 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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