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Blackhawk Mountain (b)
Basic information Name: Blackhawk Mountain (b)
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2016
Country: United States
Mass:help 52.4 g
Meteoritical Bulletin:  MB 108  (2020)  L6
Recommended:  L6    [explanation]

This is 1 of 12924 approved meteorites (plus 11 unapproved names) classified as L6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 25 Feb 2019
Writeup from MB 108:

Blackhawk Mountain (b)        34°24.8’N, 116°46.4’W 

California, United States

Find: 2016 Jun 18

Classification: Ordinary chondrite (L6)

History: While visually searching for meteorites near the toe of the Blackhawk Landslide in Lucerne Valley, Mark Bittmann recovered a 52.4 g fragment of a chondritic stone which had only a slight attraction to a magnet. Found 2.3 miles west of the Bessemer Mine Road on the surface of an alluvial fan, that is mapped as "older alluvium", and not on the more recent, disturbed-surface of the nearby landslide. A conscientious search by a team of recovery experts did not result in any additional finds.

Physical characteristics: The flat, half-dome-shaped, brownish-orange fragment has two surfaces; one is a well-preserved exterior surface, by evidence of having retained the curvature of an outside corner and a relict fusion-crust. The second is a hackly, more recently broken, lighter-colored, brownish-orange surface. The cross-sections of chondrules are readily visible through the relict fusion-crust, but not discernible on the broken/hackly surface. A cut surface reveals a mottled pattern of various sized chondrules (1-3 mm) and metal-grains (up to 1.5 mm) in a yellowish-orange groundmass. Metal-grains (and troilite) have stained the neighboring matrix to a dark-brown color.

Petrography: (D. Sheikh, FSU) Chondrule boundaries blurred (496 μm, N=1). Recrystallized coarse-grained matrix with plagioclase (>60 μm).

Geochemistry: Olivine, Fa24.0±0.2 (N=25); orthopyroxene, Fs21.6±0.2Wo1.7±0.2 (N=25).

Classification: Ordinary Chondrite (L6)

Specimens: 10.6 grams at UCLA; main mass with Verish.

Data from:
  Table 0
  Line 0:
Date:2016 Jun 18
Mass (g):52.4
Shock stage:S4
Weathering grade:W4
Fayalite (mol%):23.99±0.18 (N=25)
Ferrosilite (mol%):21.64±0.20 (N=25)
Wollastonite (mol%):1.71±0.20 (N=25)
Classifier:D. Sheikh, FSU
Type spec mass (g):10.6
Type spec location:UCLA
Main mass:Verish
Finder:Mark Bittmann
Comments:Fieldname = UU160618 (thin-sectionID# = BESS); submitted by Daniel Sheikh
   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)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Verish: Robert Verish, Meteorite-Recovery Lab, P.O. Box 463084, Escondido, CA 92046, United States; Website (private address; updated 27 May 2009)
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
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United States
     Recommended::   (34° 24' 48"N, 116° 46' 24"W)

     This is 1 of 269 approved meteorites from California, United States (plus 24 unapproved names)
     This is 1 of 1930 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters)
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