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Willow Wash
Basic information Name: Willow Wash
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2006
Country: United States
Mass:help 552 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  H3.5
Recommended:  H3.5    [explanation]

This is 1 of 20 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 15 May 2008
Writeuphelp
Writeup from MB 94:

Willow Wash                         35°2224.88’’N, 115°20’’37.95’’W

San Bernardino County, CA, USA

Find: 14 September 2006

Ordinary chondrite (H3.5, breccia)

History: The stone was found by Steve Humeston in an area covered with sand, scattered rocks and sparse native vegetation.

Physical characteristics: A single stone of 552 g was recovered. It was completely covered with fusion crust.

Petrography: (A. Rubin, UCLA) Chondrule outlines are well defined; there has been little integration between chondrules and matrix. Some chondrules contain glassy mesostases. The rock has been shocked; olivine grains exhibit undulose extinction under crossed polarizers in the petrographic microscope; the olivine grains contain planar fractures in their crystal structure caused by shock. The rock is moderately weathered; between 20% and 60% of the metal grains have been at least somewhat oxidized. The rock is also a breccia. It contains a clast that has experienced more significant shock than the host; much of the metal and sulfide in the clast was melted and mobilized by shock. The boundary between the clast and the host is sharp.

Mineral compositions and geochemistry: The rock is unequilibrated with a large range in olivine composition (Fa 12.8–30.9 mol%, n = 13). The mean Fa content is 20.9 ± 4.7 mol% and it has a percent mean deviation (PMD for Fa) of 17.2.

Classification: Ordinary chondrite (H3.5 breccia), S3, W2.

Type specimens: A total sample mass of 30 g is on deposit at UCLA. The remaining mass of 472 g is in the possession of the finder.

Data from:
  MB94
  Table 3
  Line 6:
State/Prov/County:San Bernardino County, CA
Date:14-Sept-2006
Latitude:35° 22'24.88"N
Longitude:115° 20' 37.95" W
Mass (g):552
Pieces:1
Class:H3.5
Shock stage:S3
Weathering grade:W2
Fayalite (mol%):12.8-30.9
Classifier:A. Rubin, UCLA
Type spec mass (g):30
Type spec location:UCLA
Main mass:SHumeston
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Geography:

United States
Coordinates:
     Recommended::   (35° 22' 25"N, 115° 20' 38"W)

Statistics:
     This is 1 of 266 approved meteorites from California, United States (plus 24 unapproved names)
     This is 1 of 1878 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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