Verb
To develop or cause to develop into schist.
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If the desired proportions are not attained naturally, the formation and deposition of coaldust may occasionally be considerably lessened by the adoption of simple precautions, such as: watering at the face, so as to lessen the dust deposits in the return airways; washing the tubs, and using sound tubs that will not shed so much dust in the haulage roads; and limewashing, which fixes the dust on the walls and schistifies the floor.
In other mines with a shale roof, the constant dropping of top- rock serves, especially when it tends to slake, to schistify the floor of the mines.
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To the west along the strike from the main schist and quartz body, the conglomerate is drag-folded and schistified, and there is but little quartz or sulphide up to 430 feet from the shaft, where a schist lens has been trenched for 50 feet along the strike and 30 feet across at its widest point.