Orthoclase from selected localities.
UK | |
| Reid, C., Flett, J.S., Wilkinson, B.S.N., Dixon, E.E.L., Pollard, W., and MacAlister, D.A. (1907): The Geology of the Land's End District. HMSO Publications (London), pp. 46-47. |
| Collins, J.H. (1892): "A Handbook to the Mineralogy of Cornwall and Devon", 2nd ed., D. Bradford Barton Ltd. (Truro, UK), pp. 108. |
| Sir Arthur Russell (1949) The Wherry Mine, Penzance, Its History and its Mineral Productions. Mineralogical Magazine 28:517-533. |
| Ian Jones collection |