Microcline from Mangualde, Viseu, Portugal
Portugal | |
| Grice, J. D., Dunn, P. J., & Ramik, R. A. (1990). Jahnsite-(CaMnMn), a new member of the whiteite group from Mangualde, Beira, Portugal. American Mineralogist, 75(3-4), 401-404. |
various photographs | |
King, Van (n.d.) Personal communcation. | |
King, Van (n.d.) Personal communcation. | |
| Alves, Pedro (n.d.) Personal communication. |
| Nuno Afonso collection |
Nossa Senhora da Esperança quarry, Quintela de Azurara, Mangualde, Viseu, Portugal