Pumpellyite-(Mg) (Var: Chlorastrolite)
Iron City Mine, Mosquito Mining District, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA
This specimen of chlorastrolite (a variety of pumpellyite-(Mg)) in basalt was found in August, 2013 at the Iron City Mine, located in Keweenaw County, Michigan. The entire specimen measures approx. 5 cm across with the individual vug measuring approx 1.3 cm across. This was one of several nice specimens that were collected during this trip.
© Paul T. Brandes