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Yucca 031
Basic information Name: Yucca 031
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2013
Country: United States
Mass:help 34.3 g
Meteoritical Bulletin:  MB 104  (2015)  H6
Recommended:  H6    [explanation]

This is 1 of 6544 approved meteorites (plus 5 unapproved names) classified as H6.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 27 Mar 2015
Writeup from MB 104:

Yucca 031        34°45’28.67"N, 114°15’29.38"W

Arizona, United States

Find: 2013 Dec 14

Classification: Ordinary chondrite (H6)

History: A 34.3 g meteorite was found by Twink Monrad while she was hunting for Franconia meteorites with a metal detector. It was found at the top of a hill buried 18 cm deep in soft dirt. The stone appears to be oriented, as it is cone shaped with a slight rollover lip on the back side.

Physical characteristics: Exterior of the stone is covered with brownish weathered fusion crust. The interior is brown with light-colored patches. It has an even distribution of fine metal and troilite grains, estimated 45 areal %. A few chondrules to 1 mm are visible.

Petrography: The stone is largely recrystallized with sparse chondrules. A probe section shows several BO chondrules. Plagioclase grains up to 100 μm are abundant. Chromite is irregularly shaped, to 500 μm. Metal is dominated by irregularly shaped single-crystal kamacite grains to 0.7 mm, which lack shock features. Tetrataenite and plessite are rare. Troilite grains are single crystals and lack shock features. Kamacite/taenite grain boundaries are smooth. One 20 μm native Cu nugget was found. Weathering is minor.

Geochemistry: (L. Garvie, ASU) Olivine Fa19.7±0.5, FeO/MnO=38.7±2.0, n=9; low Ca pyroxene Fs17.3±0.2Wo1.2±0.2, FeO/MnO=23.5±0.8, Cr2O3 = 0.11±0.05 wt%, n=12; high Ca pyroxene Fs6.2±0.5Wo45.5±1.6, FeO/MnO=18.5±1.0, Cr2O3 = 0.7±0.1 wt%, n=5; kamacite Ni=6.1?0.4 wt% and Co=0.5±0.0 wt%, n=6.

Classification: Ordinary chondrite, H6, S1, W1

Specimens: 12.1 g at ASU.

Data from:
  Table 0
  Line 0:
Date:2013 Dec 14
Mass (g):34.3
Shock stage:S1
Weathering grade:W1
Fayalite (mol%):19.7±0.5
Ferrosilite (mol%):17.3±0.2
Wollastonite (mol%):1.2±0.2
Classifier:L. Garvie, ASU
Type spec mass (g):12.1
Type spec location:ASU
Main mass:Twink Monrad
Finder:Twink Monrad
Comments:Submitted by L. Garvie
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
References: Published in Meteoritical Bulletin, no. 104, MAPS 52, 2284, Octover 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12930/full
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Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Michael Mulgrew                  

United States
     Recommended::   (34° 45' 29"N, 114° 15' 29"W)

     This is 1 of 178 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1894 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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