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USA | |
| [var. Carbonate-rich Fluorapatite] London, D., Burt, D.M. (1982) Alteration of spodumene, montebrasite and lithiophilite in pegmatites of the White Picacho district, Arizona. American Mineralogist: 67: 97-113. |
| [var. Manganese-bearing Fluorapatite] London, D., Burt, D.M. (1982) Alteration of spodumene, montebrasite and lithiophilite in pegmatites of the White Picacho district, Arizona. American Mineralogist: 67: 97-113. |