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Yucca 043
Basic information Name: Yucca 043
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2004
Country: United States
Mass:help 535 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  H3-6
Recommended:  H3-6    [explanation]

This is 1 of 75 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 Jul 2016
Writeuphelp
Writeup from MB 105:

Yucca 043        34°46.043’N, 114°13.350’W

Arizona, United States

Find: 2 March 2004

Classification: Ordinary chondrite (H3-6)

History: Sample was found as 7 nearby pieces that were glued together by finder to form a single stone, but which fell apart during cutting.

Petrography: In thin section, the sample appears to be relatively integrated, with a texture resembling a type 5 chondrite comprised primarily of chondrule fragments. Smaller chondrule and mineral fragments occur between the larger fragments. With the exception of a large (~1.5 mm across) angular feldspathic cryptocrystalline clast, lithic clasts are absent. BSE imaging shows that most of the meteorite contains equilibrated silicate, but that there is a substantial (~10 area %) admixture of type 3 material (both magnesian and iron-rich zoned olivine and pyroxene grains). Most of the equilibrated material contains devitrified glass or small (< 50 μm) plagioclase feldspar grains; coarse (>50 μm) plagioclase is also present. A particularly large (90 × 475 μm) plagioclase feldspar grain was observed adjacent to the cryptocrystalline pocket. Clinoenstatite, silica polymorph, chlor-apatite, merrillite, chromite-plagioclase objects, metallic copper, and an Fe-Ni carbide phase were observed. Notable is one roughly rectangular (100 × 250 μm) chromite-plagioclase intergrowth surrounded by successive bands of chromite, plagioclase feldspar, high-calcium pyroxene, and phosphate. Additionally, one high-Ca pyroxene grain has elevated alumina, similar to aluminous pyroxene grains reported for Buck Mountain Wash.

Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Representative analyses for fragments and chondrule (includes both equilibrated and unequilibrated grains): olivine (Fa18.9±4.0, N=112), low-Ca pyroxene (Fs17.0±4.5Wo1.3±0.7, N= 98).

Classification: Meteorite represents an intimate mixture of fragmental material. Type 3 is inferred from presence of zoned magnesian and ferroan olivine grains; type 6 from coarse (>50 μm) plagioclase feldspar grains. It is classified as an H3-6 genomict breccia. Paired with Buck Mountain Wash (Yucca 002).

Specimens: Cascadia holds 65.8 g in multiple pieces, in addition to one polished thin section and a mounted butt.

Data from:
  MB105
  Table 0
  Line 0:
State/Prov/County:Arizona
Origin or pseudonym:upland pediment
Date:2 March 2004
Latitude:34°46.043'N
Longitude:114°13.350'W
Mass (g):535
Pieces:7
Class:H3-6
Shock stage:S4
Weathering grade:W1
Classifier:M. Hutson, Cascadia
Type spec mass (g):65.8
Type spec location:Cascadia
Main mass:Larry Sloan
Finder:Dale Lamb
Comments:Lab number CML0847.; 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° 46' 3"N, 114° 13' 21"W)

Statistics:
     This is 1 of 175 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1881 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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