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Hardpan Flat
Basic information Name: Hardpan Flat
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2015
Country: United States
Mass:help 2.6 g
Meteoritical Bulletin:  MB 109  (2020)  Ureilite
Recommended:  Ureilite    [explanation]

This is 1 of 657 approved meteorites classified as Ureilite.   [show all]
Search for other: Achondrites, Ureilites
Comments: Approved 5 Apr 2020
Writeup from MB 109:

Hardpan Flat        41°7.0’N, 118°19.0’W

Nevada, United States

Find: 2015 Aug 06

Classification: Ureilite

History: While searching for meteorites on the evening of 2015 August 06, Robert Verish hastily gathered a bagful of pebbles from the surface of a dry lake just before nightfall. It was not until 2019 August that he scrutinized the contents of that bag, and recognized one of the small pebbles as being a meteorite.

Physical characteristics: This 2.6 g, black fusion-crusted, oriented pebble has a well-preserved exterior. A cut surface reveals a gray, coarse-crystalline matrix.

Petrography: The silicates are about 90% olivine, 10% pigeonite. In typical ureilite fashion an additional minor component is dark interstitial matter, presumably carbon; and olivine rims are sprinkled with tiny Fe-metals formed by reduction. The silicates are uniformly close to 1.0 × 0.5 mm; with maximum dimension found (in one small thin section) about 1.8 mm. The silicate grains show a clear preferred alignment of their long axes (lamination).

Geochemistry: Olivine core composition clusters very tightly at Fa16.48±0.14 (9 analyses), but reduced rim compositions (7 analyses) are as FeO-depleted as Fa3.3. Pigeonite clusters very tightly at Fs14.2Wo8.8 (8 analyses).

Classification: Ureilite

Specimens: 1.1 grams at UCLA; main mass with Verish.

Data from:
  Table 0
  Line 0:
Origin or pseudonym:dry lake
Date:2015 Aug 06
Mass (g):2.6
Shock stage:moderate
Weathering grade:moderate
Fayalite (mol%):16.48±0.14
Ferrosilite (mol%):14.15±0.14
Wollastonite (mol%):8.8±0.1
Classifier:P Warren, UCLA
Type spec mass (g):1.1
Type spec location:UCLA
Main mass:Robert Verish
Finder:Robert Verish
Comments:Fieldname = USA150806; lab ID# = V-HF-A. Verish's address: R. Verish, Meteorite-Recovery Lab, P.O. Box 463084, Escondido, CA 92046; submitted by Paul Warren
   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)
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. 109, in preparation (2020)
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Public domain photographs:
Paul Warren                        

United States
     Recommended::   (41° 7'N, 118° 19'W)

     This is 1 of 183 approved meteorites from Nevada, United States (plus 4 unapproved names)
     This is 1 of 1924 approved meteorites from United States (plus 867 unapproved names) (plus 28 impact craters)
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