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Summary:
This is an attractive oily looking green to black fine-grained rock that can be scatched easily with a knife. It is composed almost completely of serpentine-group minerals, e.g. antigorite, lizardite, chrysolite. It is formed by the late-stage hydrothermal alteration of ultramafic rocks such as peridotite and picrites. It does make an attractive ornament when calved.
Recommended sites:
Kynance Cove, Lizard, Cornwall
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