Agates belongs to microcrystallin quartz family like chalcedony and jasper.
They are easily distinguishable from chalcedony because of their zoned coloration which could be concentric, sinuous or brecciated. This alternation of successive layers is due to the stone's pace of growth. Since Antiquity agates are highly sought for their soothing properties. In lithotherapy, they are considered as anchorage and luck stones. They also harmonize the ying and the yang. Agates are calming stones acting gently.
Warning : The use of minerals in lithotherapy does not in any case exclude the continuation of a medical treatment and to consult a doctor.