mineralogy of alkaline rocks from the Elk massif, northeastern Poland by Theodore J. Armbrustmacheri and.................... 6 Petrography of rocks of the Elk massif ........................ 7 Nepheline syenite...9 ILLUSTRATIONS Figure 1. Map of northeastern Poland showing the location of the alkaline massifs .............................. Figure 2. Map of the Elk massif showing the location of bore holes ... Figure... 7. Table 8. Chemical data for rocks from the Elk massif ............... Rock types and mineral phases