Silver

Here's a specimen consisting of native silver running through the cracks of its dolomitic host rock. From Cobalt, Ontario, a very historic mining town! The silver is tarnished black but could easily made silvery again. An oldy!

Silver was discovered on the shores of Cobalt Lake in the summer of 1903. Within a few years, Cobalt became one of the world's largest silver producers, supplying an astonishing 333 million ounces, or more than 10,000 tonnes, of silver by 1922 from 100 mines.