4.4" Sky Blue, Botryoidal Chrysocolla - Congo

This colorful specimen contains a mass of blue-green botryoidal chrysocolla pseudomorph, coating a rock matrix. Most of the specimen is covered in spherical formations of chrysocolla, with very feint remnants of green malachite. The coloration varies throughout the specimen, some portions displaying sky-blue, with the remaining chrysocolla being blue-green and turquoise.

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 can also 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 bluish-green, bright green, light blue, to even sometimes multicolored specimens depending on the atmosphere present during formation.
Democratic Republic of the Congo
4.4" long, 3.8" wide