Black Hill is a famous locality for agates of the “sagenitic Typus” - in this case the nodules are containing pseudomorphic formations of chalcedony after fine fibrous crystallized zeolithic minerals.

More informations about scottish agates are given in Dr.H.G. Macpherson´s book “agates” (published by the British Museum (Natural History) and the National Museums of Scotland).

You can find more informations about scottish agates on the following webpages:

Chris Harlow´s webpage about scottish agates 

Nick Crawford´s webpage scotsagate

H.Currie Minerals of Scotland

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