A mineral form of hydrated sodium tetraborate (Na2B4O7.4H2O),
first found in 1926 associated with borax
in Kern County, California. Deposits of it were later discovered and mined
in Argentina, Spain, and Turkey. Kernite forms colorless monoclinic crystals,
and occurs as veins in clay shale beds. It
is a major source of boron.
AND PLANETARY SCIENCE