Quartz from Iron Mine Hill quarry, Cumberland, Providence County, Rhode Island, USA
USA | |
| [var. Amethyst] White, J.S., Cook, R.B. (1990) Amethyst Occurrences of the Eastern United States. The Mineralogical Record 21:3. 203-213. Miller, C.E. (1972) Minerals of Rhode Island, 83 pages. |