Finite Geological Feature 

Some sites display finite and irreplaceable geological features such as rare mineral veins; in some cases, the feature is unique and represents the only known example. Irresponsible collecting is a major threat, and in extreme cases can lead to destruction of the site. The conservation principle is to permit controlled scientific usage, which may include specimen collecting, while safeguarding the future of the asset. 

____________________________________________________________________________ 

Case study

Hope’s Nose  SSSI, Devon (Prosser at al, p108)
 
____________________________________________________________________________

Resources

Good Quarry - a joint project of the University of Leeds and the Mineral Industry Research Organisation, aimed at all who have an interest in the environment and quarrying