San Joaquin               32°9.994’N, 111°7.031’W

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.