Nevada Meteorite Picture of the Day

Discover the Solar System - right here in the Nevada desert! Each day a different image or photograph of a NEVADA meteorite will be featured, along with a brief explanation written by a meteorite-recovery expert.

2003 July 15
See Explanation.  Clicking on the image will download
 the highest resolution version available.


Name of Nevada Meteorite: Alkali 002 - provisional nomenclature
Credit: Image by Robert Verish, taken 2002 December 1st.

Explanation:

The above image depicts the first of 5 meteorite fragments that were found at Alkali [dry] Lake in Esmeralda County on December 1st, 2002.

Four years earlier on July 20th 1998, the 8th Nevada meteorite was found here by Nick Gessler. During those intervening years many other experienced searchers have tried in vain to make another meteorite find. In fact, I led small teams of experienced meteorite-recovery experts on two earlier attempts and had no success, as well. But after making some observations at other dry lakes about how the prevailing wind direction would be very different from one season to the next, I decided to return with another team, as soon as possible, before the snow would start to fall.
When we got to Tonopah, it started to SNOW! We were a day late! By Sunday most of the snow in the valley areas had melted, but the "dry" lakes... weren't. So we were forced to abandon our vehicles and to WALK, but only along the rocky shoreline and on the gravel bars. Walking limited the amount of area that we would be able to cover that day. So, it became imperative to chose only that portion of the shoreline that was the most promising. By having studied the history of the weather patterns and prevailing wind direction for this area, I was able to narrow down this "most promising" area to just a 1 mile stretch of shoreline. We focused our search along this stretch of shoreline.
After only a few hours, we found "an out-of-place stone" on a broad area of widely scattered pebbles and small cobbles that had a sharp demarcation, which appeared to have been at one time a shoreline. It was a fragment of a chondritic stone meteorite.
We found four more fragments, all within a narrow area, or "accumulation zone". With all but one small fragment, I was able to "physically pair" all the larger fragments. This one small fragment was later found to be an LL6 impact breccia that is unpaired to the other four fragments.

Some more IMAGES:
Alkali (H6 S2 W2)
Alkali 002 (prov.) (H5 S3 W3) - All 4 fragments side-by-side.
Close-up of the "A" fragment of Alkali 002 (prov.) "in-situ"
Close-up of a cut surface on Alkali 002 (prov.) (H5 S3 W3)
"Alkali 003" There was a 5th fragment (8 grams) that didn't physically fit to this puzzle. It has been classified as an LL6 impact breccia, and is unpaired to the other 4 fragments. This "5th fragment" would then become "Alkali 003".
UPDATE: On a subsequent trip (2003Aug18) another fragment was found. This 27.7g piece was able to be physically paired to the original 8g find. Both of these fragments will form the singular stone that will be known as "Alkali 003".

(Scale is 1 centimeter cube.)

For Reference:

Alkali [Lake]
3752'N 11724'W
Esmeralda County, Nevada, USA
Found 1998 July 20
Ordinary chondrite (H6)
Two stones, weighing a total of 30.47 g, were recovered two miles apart by Nicholas Gessler from the dry surface of Alkali Lake.
Mineralogy and classification (A. Rubin, UCLA) olivine, Fa 19.3; shock stage, S2; weathering grade,W2.
Specimens: type specimen, 5.4 g, UCLA; main mass, Gessler.

Alkali 002
[Nomenclature pending approval]
Esmeralda County, Nevada, USA
Found 2002 December 01
Ordinary chondrite (H5)
One (reconstructed) stone, from 4 physically-paired fragments, weighing a total of 163.1 g, were recovered ~20 meters apart along the shoreline of Alkali Dry Lake. [Within this same ~80 square meter area, a 5th fragment (7.75 grams) was found, as well, but has been subsequently identified as being an LL6 breccia and is not paired to any previously found stone from Alkali Dry Lake.]
Mineralogy and classification (A. Rubin, UCLA) olivine, Fa 17.7; shock stage, S3; weathering grade, W3.
Specimens: type specimen, 26.1 g, UCLA; main mass, Verish(MRF).

Tomorrow's picture: back to Roach Dry Lake and the Devil Peak Meteorite


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Authors & editors: Robert Verish (Meteorite-Recovery Lab)