Barium sulfate; a mineral frequently used to increase the weight or density of drilling mud.
Its relative density is 4.2 (or 4.2 times denser than water).
See barium sulfate, mud.
Weighting material with a specific gravity of 4.37 used to increase the apparent density of a liquid drilling fluid system.
Barite [baso4] is the most common weighting agent used today.
It is a mined material ground to an api specification such that particle sizes are predominantly in the 3 to 74 micron range.