Copper Heart 1" - small Polished Pebbles but also has opaque portions

but also has opaque portions with earthy tones of black

This is a 5 lb lot

The spots are formed through devitrification when molecules within glass (which has no crystal structure) change their structure and crystallize

light pink

This specimen features light pink and dark pink banded agate with a small quartz center

Copper Heart 1" - small Polished Pebbles but also has opaque portionsMichigan's Keweenaw Peninsula is considered the most important locality in the world for pure native copper Mining began in 1845 and continued through 1982, and over 7 million tons of refined copper were recovered from the mines. At the turn of the 20th century it led the world in copper production and "Lake Copper" was the purity standard. The chemical symbol for copper is Cu. Shiny copper heart 1. 75" wide