07321 - Extremely Beautiful 3.99 Inch Brazilian Agate Slice (Chalcedony Geode Section) Geological Samples Errachidia province

Errachidia province

North America continued separating from the rest of Laurasia

buried ~50 cm below the surface

In: 56th Field Conference Guidebook

Ecology: fast-moving low-level epifaunal deposit feeder

07321 - Extremely Beautiful 3.99 Inch Brazilian Agate Slice (Chalcedony Geode Section) Geological Samples Errachidia provinceAgate 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