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Arivaca
Basic information Name: Arivaca
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 1999
Country: United States
Mass:help 30.1 g
Classification
  history:
Meteoritical Bulletin:  MB 94  (2008)  Eucrite-mmict
Recommended:  Eucrite-mmict    [explanation]

This is 1 of 130 approved meteorites classified as Eucrite-mmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 4 May 2008
Writeuphelp
Writeup from MB 94:

Arivaca                       31° 35 38.09’’N, 111° 22 12.84’’ W

Arizona

Find: January 1999

Achondrite (eucrite)

History: Found by Carl Esparza on the historic Wilbur Cruce Ranch near Arivaca, Arizona, in January 1999.

Physical characteristics: A single 30.1 g naturally broken stone, about half coated by dark brown fusion crust. The weathered former interior surfaces are gray and white in color. Sparse small grains of metal are visible on a freshly cut surface.

Petrography: (A. Irving and S. Kuehner, UWS) The specimen is a breccia composed of fragments of ophitic-textured basaltic eucrites and related mineral fragments (possibly from more than one precursor lithology) plus small grains of Ni-poor metal. The major minerals are low-Ca pyroxene (mostly orthopyroxene with sparse exsolved blades of clinopyroxene, but also some homogeneous pigeonite) and calcic plagioclase, with accessory clinopyroxene, silica polymorph, ilmenite, chromite, and troilite (some finely intergrown with clinopyroxene and silica). Orthopyroxene host (Fs55.3–55.7Wo2.6–2.9, FeO/MnO = 30.5–34.6), plagioclase (An82.5–83.7Or2.1–1.9)

Classification: Achondrite (basaltic eucrite). This brecciated specimen contains more metal than most eucrites. Specimens: A total of 6.4 g and one polished thin section are on deposit at UWS. The main mass is held by CEsparza.

Data from:
  MB94
  Table 3
  Line 1:
State/Prov/County:Arivaca, Arizona
Date:Jan-1999
Latitude:31°35'38.09"N
Longitude:111°22'12.84"W
Mass (g):30.1
Pieces:1
Class:Monomict eucrite
Ferrosilite (mol%):55.3-55.7
Wollastonite (mol%):2.6-2.9
Classifier:A. Irving and S. Kuehner, UWS
Type spec mass (g):6.4
Type spec location:UWS
Main mass:CEsparza
Comments:plag (An82.5–83.7 Or2.1–1.9)
Institutions
   and collections
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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Photos:
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Michael Blood   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
MeteoriteCollector.org - FCOM - Russ Finney   
Geography:

United States
Coordinates:
     Recommended::   (31° 35' 38"N, 111° 22' 13"W)

Statistics:
     This is 1 of 130 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1738 approved meteorites from United States (plus 263 unapproved names) (plus 28 impact craters)
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