Each rock varies as you can see and yours will be similar to those shown here.
These are also great for fairy gardens or shade gardens or any other type garden. Display it as I have on some old bones etc to show off the beauty of this one of a kind piece from Mother Nature herself!
Large Lichen rock listed here:
Will vary but be about 3-5" wide and may be flat or tall with a variety of lichens growing as see in the photos here. Larger sizes are available up to 12" and can fit in flat rate boxes too.