This Copper Heart weighs 5.3oz (152g) and measures 1 7/8" long, 1 1/2" wide, and 3/8" thick. Beautiful as is or ready to inspire something of your own creation! Michigan's Keweenaw Penisula is the most important locality in the world for pure native copper. Mining began in 1845 and continued until 1982 with over 7 million tons of refined copper mined. In the early 1990's, it led the world in copper production and "Lake Copper" was the purity standard to which other refined copper was compared. Copper is renowned for its conductive properties and used in wires to transmit energy...explore this metal for yourself and see what it has to share with you.