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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:
Meteoritical Bulletin:  MB 110  (2022)  H4
Recommended:  H4    [explanation]

This is 1 of 6493 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 Gattacceca J., McCubbin F.M., Grossman J., Bouvier A., Chabot N.L., D'Orazio M., Goodrich C., Greshake A., Gross J., Komatsu M., Miao B., and Schrader D. (2022) The Meteoritical Bulletin, No. 110. Meteorit. Planet. Sci. 1-4
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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 269 approved meteorites from California, United States (plus 24 unapproved names)
     This is 1 of 1927 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters)
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