Sericitic quartzite
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Sericitic Quartzite is a rock type which contains intermediate proportions of quartz and sericite and acts as a brittle 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.
See Also: Vitreous quartzite and Siltite-argillite