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. It traveled to market on 20-mule team wagons in the 1880s. Within a decade, purer forms of borax such as ulexite colemanite, kernite, and priceite were being mined and shipped via railroad lines.
Ulixite. Average: L 2.5, W 1.5 cm
Death Valley National Park, DEVA 3412