K Feldspar from Mangualde, Viseu, Portugal
Portugal | |
| Cassat, Y. M. F. D., & Orlandi, A. (1989). Rittmannite, a new mineral species of the whiteite group from the Mangualde granitic pegmatite, Portugal. Canadian Mineralogist, 27, 447-449. |
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Portugal | |
| Cassat, Y. M. F. D., & Orlandi, A. (1989). Rittmannite, a new mineral species of the whiteite group from the Mangualde granitic pegmatite, Portugal. Canadian Mineralogist, 27, 447-449. |
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