John Kammerer

Hematite, Goethite image

Hematite, Goethite

Minnesota DNR collection at the Moose Lake Agate and Geological Center

Quartz with Hematite image

Quartz with Hematite

Minnesota DNR collection at the Moose Lake Agate and Geological Center

Quartz, Goethite image

Quartz, Goethite