Kernite [hydrated sodium borax] Sample
US Borax & Chemical Corp

Borax was mined in a variety of locations in Death Valley and was found in several forms. Cottonball was found in salt deposits on the valley floor. In the 1880s, i was moved to market on 20-mule team wagons. Within a decade, purer forms of borax such as ulexite colemanite, kernite, and priceite were being mined and shipped via railroad lines.
Kernite. L 15.5, W 2.5 cm
Death Valley National Park, DEVA 14661