Fluorite from selected localities.
USA | |
| The Iron Mines of NJ (1910), Bayley: 221. |
| Jaffe, H.W., Molinsky, V.J. (1962) Spencite, the yttrium analogue of tritomite from Sussex Co., New Jersey. American Mineralogist: 47: 9-25.; US Dept. of Int. Bur. of Mines ROI #6885 (1967):12. |