Pebbles of "yooperlite," from the Lake Superior shore (Luce and Chippewa counties), upper peninsula, Michigan. These are clasts of syenite containing fluorescent sodalite.
About 1.4-1.6" x 1.1-1,2: x 0.3-0.6" (35-40mm x 27-30mm x 7-15mm)
Sold individually. Size, shape and color vary.