A very uncommon Lake Superior Agate with a cast of Calcite crystals,I put some molding compound into the cast to produce a positive impressing of the crystal to better ID it, neat effect,collected at Brockway Mountain,Keweenaw county,Michigan in the collecting season of 2017. It is 7/8" x 11/16" x 1/2" ,it has been worked on up to 600,not polished did not want to mess up the negative cast. Buyer pays all shipping  by small flat rate box or international postal codes and extra insurance if requested and will combine items for cheaper shipping cost. Thanks for looking and look at our store for other mineral specimens and Lake Superior Copper banded/replacement Agates and Copper included Agates some of the oldest and rarest Agates on this planet.