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Robbers Roost
Basic information Name: Robbers Roost
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2020
Country: United States
Mass:help 161 g
Classification
  history:
Recommended:  H4    [explanation]

This is 1 of 6340 approved meteorites (plus 2 unapproved names) classified as H4.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 18 Sep 2021
Writeuphelp
Writeup from MB 110:

Robbers Roost        35°33.30’N, 118°1.6’W

California, United States

Find: 2020 June 06

Classification: Ordinary chondrite (H4)

History: On 2020 June 6, a 161 g stone was found by Louis Cornell while he and his work-team were transplanting chaparral bushes for the Bureau of Land Management in Kern County.

Physical characteristics: A lightly weathered, brown stone. A 6-sided rectangular, nearly whole-individual, having two thumbprint-shaped regmaglypts, with only one hackly side missing fusion-crust, but having one obvious chondrule sticking-out in high relief.

Petrography: (D. Sheikh, FSU) Sample is an ordinary chondrite containing chondrules (Av. 500±50µm), Fe-Ni metal, troilite, and merrillite.

Geochemistry: Olivine (Fa19.6±0.8, range Fa18.3-21.8, n=23), Low-Ca Pyroxene (Fs16.7±0.6Wo1.3±0.2, range Fs15.9-17.9Wo0.9-1.5, n=16).

Classification: Ordinary Chondrite (H4)

Specimens: 20 g and a thin section at UCLA; main mass with Verish.

Data from:
  MB110
  Table 0
  Line 0:
State/Prov/County:California
Origin or pseudonym:alluvial fan
Date:2020 June 06
Latitude:35°33.30'N
Longitude:118°1.6'W
Mass (g):161
Pieces:1
Class:H4
Shock stage:S2
Weathering grade:W2
Fayalite (mol%):19.6±0.8
Ferrosilite (mol%):16.7±0.6
Wollastonite (mol%):1.3±0.2
Classifier:D. Sheikh, FSU
Type spec mass (g):20
Type spec location:UCLA
Main mass:Verish
Finder:Robert Verish
Comments:Fieldname = USA200606; thin-section# = V-LC-20; submitted by Daniel Sheikh; submitted by Daniel Sheikh
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)
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)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh                  
Geography:

United States
Coordinates:
     Recommended::   (35° 33' 18"N, 118° 1' 36"W)

Statistics:
     This is 1 of 268 approved meteorites from California, United States (plus 24 unapproved names)
     This is 1 of 1885 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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