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San Joaquin
Basic information Name: San Joaquin
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: No
Year found: 2005
Country: United States
Mass:help 31.8 g
Meteoritical Bulletin:  MB 94  (2008)  L5/6
Recommended:  L5/6    [explanation]

This is 1 of 191 approved meteorites classified as L5/6.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 27 Jun 2008
Writeup from MB 94:

San Joaquin               32°9.994N, 111°7.031W

Pima County, Arizona, USA

Find: May 1, 2005

Ordinary chondrite (L5/6)

History: Mr. Bill Braggs found the sample May 1, 2005, while looking at cacti blooms ~¼ mile NW of Snyder Hill during a visit to a friend. The stone was found on the surface with no other rocks nearby.

Physical characteristics: The meteorite is one complete stone weighing 31.8 g. It exhibits an irregular, angular shape with dimensions of 4 × 3 × 2 cm; >90% weathered, black fusion crust with rusty-orange patches.

Petrography: (D. H. Hill, UAz) Chondrules range in size from 0.2 to 1.5 mm. They are mostly porphyritic and granular chondrules. Fragments of BO chondrules and a few RP chondrules are also observed. Chondrule outlines are visible but not well delineated. At least 30% of the matrix is recrystallized with chondrule boundaries not discernible. Metal and sulfide grains are ~1:1 in abundance and range from ~20–500 μm, except for one 1.3 mm metal grain. Many irregular melt pockets <40 μm across contain metal globules usually adjacent to metal grains. There is orange staining of silicates especially near metal grains. A clast, whitish in hand specimen, is composed of recrystallized material with no easily discernible chondrules and smaller metal grains than the main meteorite.

Mineral compositions and geochemistry: Olivine (Fa 24.79% ± 0.57), pyroxene (Fs 21.15% ± 1.01), and kamacite (Co 0.79% ± 0.17) (EMPA).

Classification: Ordinary chondrite (L5/6); W2, S4.

Type specimens: Mass of 5.5 g and two thin sections are on deposit at UAz. B. Braggs holds 26 g (5731 N. 3rd Street, Phoenix AZ 85012). Main mass is on loan to the UAz Mineral Museum at UAz Flandrau Science Center.

Data from:
  Table 3
  Line 4:
State/Prov/County:Pima County, Arizona
Mass (g):31.8
Shock stage:S4
Weathering grade:W2
Fayalite (mol%):24
Ferrosilite (mol%):21.1
Classifier:D. H. Hill, UAz
Type spec mass (g):26
Type spec location:Uaz
Main mass:UAz
   and collections
UAz: Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States (institutional address; updated 14 Jan 2012)
References: Published in Meteoritical Bulletin, no. 94, MAPS 43, 1551-1588 (2008)
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United States
     Recommended::   (32° 10' 0"N, 111° 7' 2"W)

     This is 1 of 178 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1886 approved meteorites from United States (plus 890 unapproved names) (plus 28 impact craters)
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