Moss Agate is comprised of minerals that make up a green colour, embedded in Chalcedony. The filaments, traces and patterns are suggestive of moss. No actual moss was harmed in the making of these stones!
Historically - Moss Agate was considered the most powerful of all the agates and was associated with warriors.
This Moss Agate is from Australia. It has a hardness of 7 on the Mohs scale.