6. Gneiss, a metamorphic rock formed from rocks like granite and sandstone
(By Huhulenik, Wikimedia Commons)
7. Blairmorite, a rare porphyritic volcanic igneous rock found in Blairmore, Alberta, Canada
(By Georgialh, Wikimedia Commons)
8. Diorite, an igneous rock found in volcano arcs near mountain ranges
(By Michael C. Rygel, Wikimedia Commons)
9. Banded Hornfels, used in Northern England as whetstones, for sharpening tools
(By Fed, Wikimedia Commons)
10. Migmatite, formed from worn down metamorphic rocks and eroded mountain bases
