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Both the altered limestone and hardened slate contain garnets in many places, also ores of iron, lead, and copper, with some silver. The granite of Cornwall sends forth veins into a coarse argillaceous-schist, provincially termed killas. This killas is converted into hornblende-schist near the contact with the veins. These appearances are well seen at the junction of the granite and killas, in St.
Agnes Beacon the coast is largely composed of clay-slates, or killas, presenting much desolate grandeur; the slate showing the jagged scars of its unending resistance to oceanic forces. At Cligga Head this slate is blended with decomposed hard granite. Off the shore, about two miles out, rise the two isolated rocks known as the Man and his Men sometimes also called the Cow and her Calf.
Robert W. Fox, "are very much influenced in their metallic riches by the nature of the rock which they traverse, and they often change in this respect very suddenly, in passing from one rock to another. Thus many lodes which yield abundance of ore in granite, are unproductive in clay- slate, or killas and vice versa.
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