Lot of Rock Crystal Druses.
Origin: Brazil.
Size: approx. 6 to 12 cm.
Weight: approx. 3,7 kg.
A rock crystal druse is a geological formation consisting of a cavity or hollow within a rock (usually igneous or sedimentary) whose walls are lined with small, well-formed crystals. These crystals are usually transparent quartz (rock crystal). They originate from the slow precipitation of minerals from hydrothermal solutions, creating a shiny, faceted inner surface.
