On the occurrence of metamorphic minerals in calcareous rocks in the Bodmin and Camelford areas, Cornwall

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Abstract
Cornwall has long been famous for the occurrence of certain minerals, found in the neighbourhood of the great granitic intrusions, that are rare in, or absent from, the aureoles of metamorphism surrounding the granites of many other regions. It is now generally recognized that these minerals have been produced by the action of certain heated gases on the rocks they penetrate along cracks and fissures ; but the exact age of this type of alteration is not so well known. It is often held to be contemporaneous with the thermo-metamorphism produced by the granite, and rocks Containing these minerals are included in the description of the ‘contact rocks’ surrounding the granite.

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