Fluorapatite from Knox County, Maine, USA
USA | |
| Morrill & Hinckley, 1959. Maine Mines & Minerals, Vol. 2 |
| P Cristofono collection, 2007 |
| |
W. B. Thompson, D. L. Joyner, R. G. Woodman, and V. T. King (2005) A Collector's Guide to Maine Mineral Localities. Maine Geological Survey Bulletin 41 |