Agate

Agate 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.

Links

About/Subject 2

	Is this an Agate? (An Illustrated Guide to Lake Superior’s Beach Stones Michigan)	Paperback
	Agate Hunting Made Easy	Paperback

Added by kitchi-gummi