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Yucca 050
Basic information Name: Yucca 050
     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:help 34.3 g
Classification
  history:
Recommended:  H3-5    [explanation]

This is 1 of 66 approved meteorites classified as H3-5.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 7 Apr 2018
Writeuphelp
Writeup from MB 107:

Yucca 050        34°48.036’N, 114°15.346’W

Arizona, United States

Find: 25 Nov 2011

Classification: Ordinary chondrite (H3-5)

History: Found by Wendy Wooddell on November 25, 2011

Physical characteristics: Sample has weathered fusion crust on one side. All other exterior faces are broken surfaces which are medium-brown from weathering, showing numerous small protruding dark bumps, which appear to represent weathered metal grains

Petrography: In thin section, the sample appears to be relatively integrated, with many chondrule fragments and only a few complete chondrules present; distinct lithic clasts typical of a breccia are absent. The material between chondrule fragments is comprised of individual grains and smaller fragments. BSE imaging shows that most of meteorite consists of fragmental material, with about a 10% admixture of magnesian and iron-rich olivine and pyroxene grains, many of which show zoning, and which abut equilibrated fragments with typical H-chondrite compositions. Numerous chromite-plagioclase objects were observed, including a fragment containing chromite-plagioclase pseudomorphs after a lath-shaped phase set in a feldspathic matrix. Throughout the section, feldspathic material consists of glass of variable compositions and crystalline plagioclase feldspar grains typically 20-40 µm across; a few grains up to 70 µm across were observed. Also present are merrillite grains, some up to 250 µm across. Fe-Ni carbide was found, along with ilmenite and magnetite.

Geochemistry: (M. Hutson and A. Ruzicka, Cascadia) Sample contains a range of compositions of olivine (Fa18.7±2.2, N=31) and low-Ca pyroxene (Fs15.2±3.6Wo1.6±0.8, N= 44).

Classification: Meteorite is an H-chondrite, based on chemistry. Although the chemistry and abundance of zoned grains suggests a type 3 designation, the presence of medium-sized crystalline feldspar, coarse phosphate, and chromite-plagioclase objects suggests a higher petrographic type. The thin section studied strongly resembles the "main" lithology found in the Buck Mountain Wash chondrite, which is an H3-5 finely intermixed genomict breccia. Paired with Buck Mountain Wash (synonymous with Yucca 002) on the basis of mineralogy, mineral chemistry, and texture.

Specimens: Cascadia holds 23.4 g in one piece, in addition to three polished thin sections. Wendy Wooddell retained a 3.8 g end piece.

Data from:
  MB107
  Table 0
  Line 0:
State/Prov/County:Arizona
Date:25 Nov 2011
Latitude:34°48.036'N
Longitude:114°15.346'W
Mass (g):34.3
Pieces:1
Class:H3-5
Shock stage:S3
Weathering grade:W1
Fayalite (mol%):18.7±2.2
Ferrosilite (mol%):15.2±3.6
Wollastonite (mol%):1.6±0.8
Classifier:M. Hutson and A. Ruzicka, Cascadia
Type spec mass (g):23.4
Type spec location:Cascadia
Main mass:Cascadia
Finder:Wendy Wooddell
Comments:Lab number CML0788; field number W232.; 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. 107, in preparation (2018)
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Geography:

United States
Coordinates:
     Recommended::   (34° 48' 2"N, 114° 15' 21"W)

Statistics:
     This is 1 of 163 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1805 approved meteorites from United States (plus 352 unapproved names) (plus 28 impact craters)
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