Ulexite
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Ulexite, sometimes called TV rock or TV stone due to its unusual optical properties, is a hydrous borate hydroxide of sodium and calcium with the chemical formula NaCaB5O66·5H2O. The mineral occurs as
Ulexite specimen from California
A fragment of ulexite displaying characteristic optical property
Borax
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Borax is a salt normally encountered as a hydrated borate of sodium, with the chemical formula Na2H20B4O17. Borax mineral is a crystalline borate mineral that occurs in only a few places worldwide in
Ulexite
…deposits, and the precipitated ulexite commonly forms a "cotton ball" tuft of acicular crystals. Ulexite is frequently found associated with colemanite, borax, meyerhofferite, hydroboracite, probertite, glauberite, trona, mirabilite, calcite, gypsum and halite. It is found principally in California and Nevada…
Borax crystals
Traction steam engine hauling borax, Death Valley, California 1904
Borax-based laundry detergent
Old steam tractor with borax wagons, Death Valley National Park