Searlesite

specimen number:
2354299

location:
Boron Open Pit, Kern Co., California, USA

description:

Colorless masses and crystalline searlesite across the top of matrix.

The Boron Open Pit, located in Kern County, California, lies within the Mojave Desert region and is world-renowned for its massive deposit of sodium borate minerals preserved in Miocene lacustrine sediments. Active mining in the area began following subterranean discoveries in the 1920s, eventually transitioning into a massive open-pit operation that became one of the primary global producers of industrial borates. Within the complex evaporite beds of the Kramer borate deposit, collectors and mineralogists have identified rarer species such as searlesite, a sodium borosilicate mineral. Searlesite typically forms as thin, radiating fibrous aggregates, delicate tufts, or tiny prismatic crystals within altered volcanic ash layers and shale matrix where borate-rich lake fluids interacted with silica-dense sediments. Highly prized by specimen collectors due to its delicate aesthetic and specialized geology, searlesite from the Boron pit represents a classic secondary mineral formed during complex diagenetic processes within an ancient closed-basin evaporite environment.

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