Chalcedony from selected localities.
UK | |
| [var: Agate] Majendie, A. (1818): Transactions of the Royal Geological Society of Cornwall 1, 32-37. |
[var: Agate] Phillips, W. (1823): An Elementary Introduction to the Knowledge of Mineralogy, 3rd ed. William Phillips (London), 535 pp.; Hogg, T. (1825): A Manual of Mineralogy. Polyblank Publishers (London), p. 193; Hall, T.M. (1868): The Mineralogist's Directory. Edward Stanford (London), 168 pp.; Collins, J.H. (1892): A Handbook to the Mineralogy of Cornwall and Devon, 2nd ed., D. Bradford Barton Ltd. (Truro, UK), 108 pp. |