Minnesota Rocks & Minerals: A Field Guide to the Land of ...
Bob Lynch
A Field Guide to the Land of 10,000 Lakes Bob Lynch. Fluorite (purple/green) on basalt Fluorite in basalt vesicle Triangular cracks Varying coloration Specimen courtesy of Jim Cordes Fluorite HaRDNESS: 4 STREak: White ENvIRoNMENT: Mine dumps, road cuts,. Specimen courtesy of Jim Cordes.