Polished Dendritic Agate - Madagascar dragon skull obsidian is an amorphous volcanic

obsidian is an amorphous volcanic glass that lacks a crystalline structure

This stunning specimen weighs 300g and measures 8cm x 6cm x 6cm

While not gem-grade

This Moonwood Petrified Wood Rough Stone is an extraordinary

Polished Dendritic Agate - Madagascar dragon skull obsidian is an amorphous volcanicThis Polished Dendritic Agate is a striking mineral specimen sourced from the rich, diverse geological deposits of Madagascar. As a semi translucent variety of chalcedony quartz, this material is defined by its complex, tree like or fern like inclusions trapped inside a clear to milky silica body. These delicate structures are formed by a process known as dendritic branching, which occurs when iron and manganese rich mineral fluids seep into micro