Siltite-argillite
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Siltite-argillite is a rock type with silt-sized quartz grains that are completely separated from each other by a large proportion of sericite and acts as a more ductile unit.
One of three rock type definitions that were first applied in the Coeur d'Alene Mining District to the Revett Formation (White and Wilson, 1982) but have since been used in describing other Belt formations as well.
