Bargain, 2.35" Polished Chrysocolla & Chalcocite? Egg - Peru

This is a beautiful, hand-polished "egg" that contains an association of blue-green chrysocolla and an unusual sulphide (chalcocite?), collected from Peru. The lapidary work is very nice, and allows for the natural formations of the mineral to be seen. It makes for a very aesthetic display piece and comes with the pictured display stand.

There are multiple cavities that contain a blue and green epoxy/mineral gap fill, likely to assist with consistent polishing of the specimen. The metallic mineral is likely chalcocite, a copper sulphide that has been known to form in union with chrysocolla.

Chrysocolla is a basic copper silicate that typically forms as a pseudomorph following other copper based minerals. The chemical formula is considered undetermined due to the varying substitutions of elements and water content in its chemical structure. However, there is a form of chrysocolla with an identifiable chemical formula of Cu2H2Si2O5(OH)4, that can be found in microcrystals.

Regularly, chrysocolla will form as botryoidal lumps and spheres, rarely forming visible crystals. It's also been known to form in both solid and fibrous veins, over fibrous minerals and in crusts. Known for its sharp and vibrant coloring, chrysocolla can display a wide variety of colors such as blueish-green, bright green, light blue to even sometimes multicolored specimens, depending on the atmosphere present during formation.
Chrysocolla & Chalcocite?
2.35" tall, 1.8" wide