Plural of borax; multiple samples or deposits of the mineral borax (hydrated sodium borate).
From 'borax,' which comes from Persian 'burah' or Arabic 'bawraq.' The -es plural ending follows standard English patterns for certain noun forms.
Borax deposits in Death Valley, California, were so valuable in the 1800s that the famous 20-mule teams were used to transport it across the desert for 165 miles!
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