Pyrrhotite
Pyrrhotite :
(n.) Drilling Fluids. A mineral containing ferrous sulfide, FeS, that typically contains inclusions of free sulfur and other minerals. It is commonly present in shales, and may occur as a trace mineral in some barite ores. Pyrrhotite can liberate sulfides in alkaline muds, with adverse consequences for safety and corrosion. See: caustic extraction test, Garrett Gas Train, hydrogen sulfide, iron sulfide, siderite, sulfide, sulfide scavenger
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