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Chlorastrolite
General Information- Michigan's Gem Stones
Pamphlet 4: Collecting Minerals in Michigan
USGS Bulletin 1309 the Geologic Story of Isle Royale National Park
Geoheritage of the Keweenaw Peninsula
Michigan's State Gemstone Pumpellyite
Geologic Resource Evaluation Report, Isle Royale National Park
HJ Hardenberg – Page 1 of 2 MICHIGAN's GEM STONES
Volume 73 Number 4 April 2020 TWO RARE and OBSCURE MINERALS
Isle Royale National Park Geologic Resource Evaluation Report
National Park Service Cultural Landscapes Inventory Edisen Fishery & Rock Harbor Lighthouse Isle Royale National Park 1999
Gems and Precious Stones of North America. a Popular Description of Their Occurrence, Value, History, Archeology, and of The
Greenstone Ron Is the Most Abundant Chromophore (An Element That Imparts Color to a Mineral by Its Presence in the Struc- Ture) in the Earth
View of Great Lakes and Their Combined Watershed/ 18
Assessment of Natural Resource Conditions, Isle Royale National Park
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