Feldspar Group from selected localities.
Norway | |
| Knut Edvard Larsen collection # 2502 |
| [var: Perthite] Dons, J. A. (1969): Interupted creations of nepheline syenite pegmatite dikes in the Langesundsfjord area, S.Norway. Norsk Geologisk Tidsskrift 49: 145-157 |