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Killas

killas rock sample

The metamorphic rock surrounding a Granite intrusion is in Cornwall, is known as Killas or Greenstone.

These are sedimentary rocks which have been baked and squeezed, by the Granite, into different rock types such as slates, phylites and hornfells. This metamorphic “aureole”, heated  zone around the granite intrusion will generally be the location of the valuable mineralised ground.

View this mineral in 3D

 

Photograph reproduced with the kind permission of the Geevor Archive

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