General Lithology:Garnet Amphibolite
Description:A metamorphic rock probably formed by the action of heat, pressure, and tectonic forces on an original igneous rock. Reddish grains of garnet and dark grains of amphibole are visible.
Representing:Rock metamorphosed during the building of the Canadian Cordillera between 100 and 50 million years ago.
Original location:Blue River, British Columbia
Estimated mass (tonnes):4.8
Donor:Courtesy of Commerce Resources Corp.