Crust

• Rank: Common
• Class: Biochemical
• Region: All regions

The unusually precise geometric figures covering the inner side of the artifact are formed simultaneously from two different allotropic modifications of calcium. The traces of organic material found in the mineral indicate the involvement of unidentified microorganisms in their formation.

Botanists suggest that such precise patterns may arise due to a mechanism similar to that of some lichens, which leads scientists to consider the involvement of plants in the appearance of the artifact.