20385 - Extremely Beautiful 5.27 Inch Brazilian Agate Slice (Chalcedony Geode Section) Dicranurus fluvial-lacustrine (2)

fluvial-lacustrine (2)

Perisphinctes is an extinct genus of ammonite cephalopod

This type of fossils are extremely rare

• Devonian of the Czech Republic

Age range: 466

20385 - Extremely Beautiful 5.27 Inch Brazilian Agate Slice (Chalcedony Geode Section) Dicranurus fluvial-lacustrine (2)Agate is a rock consisting primarily of cryptocrystalline silica, chiefly chalcedony, alternating with microgranular quartz. It is characterized by its fineness of grain and variety of color. Although agates may be found in various kinds of host rock, they are classically associated with volcanic rocks and can be common in certain metamorphic rocks. This beautiful large polished agate slices comes from southern Brazil. The stone has been soaked in a