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Venezuela | |
| [var. Ferrian Variscite] Jambor, J. L. (1963): Elroquite and phosphochromite discredited. Can. Mineral. 7, 676-677. Shepard (1877) |
| [var. Ferrian Variscite] Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York. |