Searlesite

specimen number:
2282100

location:
Silver Peak, Esmeralda Co., Nevada, USA

description:
Colorless micro crystals across one side of matrix. Nice for the species and locality, the specimen comes with a previous label from the dealership Minerals Unlimited. This is shown at the end of the video.

The Silver Peak mining district, located in Esmeralda County, Nevada, is one of the oldest gold and silver extracting regions in the state. Geologically, the area features complex tertiary volcanic complexes and thick sedimentary sequences characterized by extensive faulting and structural deformation. Mineralization occurs within low-sulfidation epithermal quartz veins hosted by proterozoic metamorphic rocks and tertiary volcanic strata, rich in native gold, electrum, silver sulfides, and base metal ores. Commercial underground mining operations began around 1864 following the discovery of the high-grade Drinkwater and Crowning Glory veins, driving the rapid development of local mill sites and the town of Silver Peak. Production fluctuated through various corporate leases, including the prominent Silver Peak Gold Mining Company in the early twentieth century, with large-scale underground and open-pit mining continuing intermittently across the district until the mid-1940s, when rising operational costs and wartime restrictions led to the cessation of primary precious metal mining.

Searlesite is a relatively uncommon sodium borosilicate mineral. It typically forms within alkaline lacustrine environments as a secondary authigenic mineral, occurring as radiating clusters of acicular needles, fibrous aggregates, or small prismatic crystals embedded within oil shales, marls, and tuffaceous sediments. First discovered and described from the ancient lake beds of Searles Lake in San Bernardino County, California, the mineral serves as an indicator of highly saline, boron-rich conditions during the evaporation of prehistoric desert basins.

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