Datolite
Manitou Island, Grant Township, Keweenaw County, Michigan, USA
This datolite specimen was collected underwater off Manitou Island, Keweenaw County. The specimen shows the typical yellow colouration of datolites found on Keweenaw Point and Manitou Island. These specimens are usually found in the basalt flowtops in "nests" that can number from a few to several hundred. Although not the rarest colour, yellow is ...