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Yucca 039
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:help 108.6 g
Classification
  history:
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
Writeuphelp
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:
State/Prov/County:Arizona
Date:28 Feb 2007
Latitude:34°45.556'N
Longitude:114°14.206'W
Mass (g):108.6
Pieces:1
Class:H3-6
Shock stage:S4
Weathering grade:W1
Magnetic suscept.:5.06
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):23.2
Type spec location:Cascadia
Main mass:Dennis Asher
Finder:Dennis Asher
Comments:Lab number CML0718; field number DA-009;; submitted by A. Ruzicka
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)
Catalogs:
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:

United States
Coordinates:
     Recommended::   (34° 45' 33"N, 114° 14' 12"W)

Statistics:
     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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