TV Stone or "Silky Spar" Ulexite sample

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 and 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.
Ulexite. L 7, W 3 cm; L 3.5, W 2 cm
Death Valley National Park, DEVA 3465