Chalcedony from selected localities.
USA | |
| Percival, James Gates. (1822), Notice of the locality of sulphate of barytes from which a specimen was analysed by Mr. G. T. Bowen; and various other mineral localities in Berlin, Conn., American Journal of Science: s. 1, 5: 42-45. |
| Schooner, Richard. (1961): The Mineralogy of Connecticut. Fluorescent House, Branford, Connecticut. |
| Van King |
State Route 9 & State Route 71 Interchange, New Britain, Hartford County, Connecticut, USA