Lake Superior Agates Field Guide by Bob Lynch (English) Paperback Book
26,80 €
While they all contain ample amounts of chalcedony and quartz, there are two types of floater agates. As chalcedony requires much more silica to form than macrocrystalline quartz, the varying amounts of each in a floater agate reflect dramatic rises and falls in the amount of available silica during the agate's formation.
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