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Roger Weller, geology instructor
Chemical Group: (your choice)...sulfate, carbonate, or chloride
Chemical Formula: 9Na2SO4.2Na2CO3.KCl
Color: white, gray, yellow Streak:
Cleavage: basal cleavage Solubility: water soluble
Crystal Forms: Hexagonal
Crystals resemble double-terminated quartz, but hanksite is soft and soluble.
Mineral Associations: halite, gaylussite, pirssonite, dolomite, aragonite,
nahcolite, trona, borax, thanardite, aphthitalite
Uses: borax ore
Borax Lake, San Bernardino County
Searles Lake, San Bernardino County (original discovery 1884)
borax sinks of Death Valley in Inyo County
Toxicity: when-swallowed- when inhaled-
Mineral was named after Henry Hanks, the first State Mineralogist of California.