Zentron Crystals Colorful Set of 12 Polished Agate Slices in Velvet Bag (Blue)

Agate is a very commonly used stone that ranges in colors can range from white/grey, blue, yellow/red or even black. They are metamorphic rock that is produced through volcanoes. This volcanic activity can be seen in the layers that are common in agate. It was very abundantly used in ancient times. It is found at many archaeological sites when it was used for hardstone carving.