Around the Normans Law - a hill northwest of Cupar - several agate-finding localities are situated. The agates from this location are famous for their distincitve structures ( not for their colours : grey and white and the idea of blue): very often chalcedony is forming thin stalactitic tubes that are enriching the pattern of fine agate-banding. These tubes are sometimes forming fine eye-agates too, if the agate-nodule was cut in an 90° degree angle to the elongation of the chalcedony-tubes.
The phenomenon of “concurrential growing” is very well demonstrated by an specimen from this location that is owned by the National museums of Scotland: Very thin stalactites of Chalcedony did penetrated the well separated but still gelatinous agate-banding. So they deformated the continous and equidistanced agate-banding into a pattern that is looking like an artwork of conditory.
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 Harlows webpage about scottish agates
Nick Crawfords webpage scotsagate
H.Currie Minerals of Scotland