Barite
is generally white or colorless, and is the main source of
barium. Baryte is the British spelling. Barite commonly
occurs
in lead-zinc
veins in limestones, in hot spring deposits, and with hematite ore. It is often associated
with the minerals anglesite and celestite. Barite has also
been used in the manufacture of paints and paper. Although
barite contains a "heavy" metal (barium),
it is not considered to be a toxic chemical by most governments
because of its extreme insolubility.