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A variety of shale or clay slate, containing iron pyrites, the decomposition of which leads to the formation of alum, which often effloresces on the rock.

The specimens procured from the Cape were clay-slate, much intermixed with iron pyrites, and crossed by small veins of white quartz.

Gold and iron pyrites, therefore, need never be mistaken for each other by any man who has a piece of steel about him.

There, close to the boundary of the province of Manila and district of Moron, I found a face of disintegrated quartz glittering with large crystals of iron pyrites.

Where you're to blame is for having gone off on a wild-goose chase and left the claims and then been bamboozled by such nonsense as sacks full of iron pyrites.