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2. New occurrences of duftite
3. Glossary of Scottish mineral species 1981
4. Small A. T. 1977. Mineralisation of the Stainmore depression and the northern part of the Askrigg Block. Unpublished Ph.D. Thesis, University of Durham.
5. NEW DATA ON TETRAHEDRITE, TENNANTITE, CHALCOPYRITE AND PYROMORPHITE FROM THE CUMBRIAN AND NORTH YORKSHIRE PENNINES