James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 1
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 2
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 3
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 4
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 5
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 6
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 7
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 8
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 9
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 10
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 11
James St. John: Yooperlite (sodalite syenite) (Lake Superior shoreline, Upper Peninsula of Michigan, USA) 12