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1. n. [Drilling Fluids]

The mineral form of ferric oxide [Fe2O3]. The hematite ore used as a weighting material in drilling muds has a mica-like crystal structure that grinds to particle size suitable for use in drilling fluids. To check for potential wear, an abrasion test is usually run on hematite as a quality control pilot test.

See: high-gravity solidsiron oxidemud additivesideriteunweighted mudwater, oil and solids testweighted mud

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