MAL204 Malachite Slab 25 The history of Lake Superior's

The history of Lake Superior's formation and how it relates to agates

and light blue banding around a very small druzy center

Stone measures 10 mm x 17 mm

This polished specimen features mossy agate in golden yellow

Cold Mountain Thundereggs are highly silicate and filled with brecciation

MAL204 Malachite Slab 25 The history of Lake Superior'sMalachite is a secondary copper mineral normally found in Africa. It has beautiful bright and deep green colors with intricate banding and botryoidal patterns. This slab is polished on both sides, with one cut edge. The chemical formula for malachite is CuCO(OH). 5. 25" x 3. 5" 6 mm thick