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Whetstone Mountains
Basic information Name: Whetstone Mountains
     This is an OFFICIAL meteorite name.
Abbreviation: There is no official abbreviation for this meteorite.
Observed fall: Yes
Year fell: 2009
Country: United States
Mass:help 2.14 kg
Meteoritical Bulletin:  MB 99  (2011)  H5
Recommended:  H5    [explanation]

This is 1 of 11607 approved meteorites (plus 23 unapproved names) classified as H5.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 1 Sep 2009
Revised 31 Jul 2012: Released coordinates
Writeup from MB 99:

Whetstone Mountains                      31.938626°N, 110.424477°W   

Cochise County, Arizona, United States

Fall: June 23, 2009 at 9:22 p.m. MST (UTC -7 hours)

      Classification: Ordinary chondrite (H5 breccia)

History:  A bright fireball with detonations and rumblings was observed by many witnesses.  Carl Hergenrother  estimated magnitude -11 fireball that created shadows, lasted for at least ~2 seconds moving from the southeast part of the sky to the east and downward.  Part of the path was recorded by the All-Sky camera at the UA-Multiple-Mirror Telescope facility on Mt. Hopkins and a security camera in Marana, AZ.  Jack L. Schrader interviewed eye-witnesses and recovered the first 155.86 g stone on the surface of the high desert less than 45 hours after the fall. Within a month of its fall, additional stones were found by Chuck Schrader, Shauna Russell, Robert Ward, Todd Parker, and Michael Farmer. Strewnfield occupies an ~3 x 6 km ellipse, trending N 30° E. Coordinates given are approximately at the center of the strewnfield.

Physical characteristics:  Total known mass as of July 15, 2009 is 2138.74 g among 10 stones.  All except one were recovered as intact individuals with complete fusion crust.  Some stones exhibit regmaglypts. Fusion crust is fresh, matte black. One stone exhibits a fusion crust with a reddish hue (not oxidation) and others contain a few “bluish” spots.

Petrography D. H. Hill (UAz): Well-defined chondrules (200-700 μm) with porphyritic olivine and pyroxene chondrules being most abundant.  Metal grains up to 800 μm and troilite up to 300 μm occur between chondrules in approximately 1:1 proportion.  Many metal grains exhibit fingerlike intergrowth of kamacite and taenite.  Mg-bearing phosphates ~100 x 200 μm occur between chondrules.  A crushed texture is observed that corresponds to a lighter lithology in a darker groundmass.  Shock veins are visible in the hand specimen.  There are two 350 μm chromite-rich clasts.

Mineral compositions and geochemistry: D. H. Hill (UAz) EMP: Olivine (Fa18.82±0.25); pyroxene (Fs16.56±0.49Wo1.77±1.7); kamacite (Ni 6.71% ± 0.28; Co 0.49% ± 0.03), taenite (26% Ni and ~40 % Ni (tetrataenite?); phosphates are mostly Mg-rich with a few Cl-bearing.  

Classification: Ordinary chondrite (H5) breccia; W0

Type specimens: A total sample mass of 20.36 g is on deposit at UAz and 131 g at ASU. Jack L. Schrader holds 787.92 g; Chuck Schrader holds 99.61 g; Shauna Russell holds 465.83 g; Ward holds 397 g; Todd Parker holds 218 g.
   and collections
ASU: Center for Meteorite Studies, Arizona State University, Tempe, Arizona 85287-1404, United States; Website (institutional address; updated 14 Jan 2012)
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. 99, April 2012, MAPS 47, E1-E52 (2012) [published online only]
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United States
     Recommended::   (31° 56' 19"N, 110° 25' 28"W)

     This is 1 of 180 approved meteorites from Arizona, United States (plus 1 impact crater)
     This is 1 of 1929 approved meteorites from United States (plus 866 unapproved names) (plus 28 impact craters)
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