Quartz and Chalcedony -- Agate basics -- Lake Superior agates -- Distribution -- Finding and identifying agates -- Formation theories -- Source of Silica -- Infiltration channels -- Concluding agate formation -- Post formation -- Agate varieties -- Adhesional banded agate -- Banded quartz agate -- Eye agate -- Floater agate -- Agate geode -- Gravitationally banded agate -- Skip-an-atom agate -- Vein agate -- Whorl agate -- Inclusions and replacements -- Copper replacement agate -- Crystal impressions -- Dendritic agate -- Fragmented membrane agate -- Jasp-agate -- Mineral inclusions -- Moss agate -- Plume agate -- Sagenitic agate -- Stalactitic agate -- Tube agate -- Color variations -- Colored macrocrystalline quartz -- Paint agate -- Rare coloration -- Surface colorations -- Weathering -- Brecciated agate -- Faulted agate -- Peeled agate -- Ventifacts -- Water-washed agate -- Final topics -- Before and after -- What is an agate?
Summary:
The definitive book on Lake Superior's agates is here. If you're a casual rock collector, you will find Agates of Lake Superior fun, interesting and beautiful. If you're a more advanced hobbyist, you will appreciate this professional and scientific resource. The book provides a thorough examination of Lake Superior's strange and unique agate varieties, as well as a critical look at agate formation theories, tips on how to find and identify agates, where to look for them and how collectible your agates may be.
This resource is supported by the Institute of Museum and Library Services under the provisions of the Library Services and Technology Act as administered by State Library of Iowa.