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Lake Superior Agate - Duluth, Minnesota. The Lake Superior agate is a type of agate stained by iron and found on the shores of Lake Superior.Its wide distribution and iron-rich bands of color reflect the gemstone's geologic history in Minnesota, Wisconsin, Nebraska, Iowa, Kansas, and Michigan.
A contemporary source suggested that the stone "commemorates a treaty between two tribes". [3] Another writer later suggested that it is a thunderstone.With the somewhat limited understanding of the day, the letter said that thunderstones "always present the appearance of having been machined or hand-worked: frequently they come from deep in the earth, embedded in lumps of clay, or even ...
Instead, researchers identified the Blinkerwall as an 11,000-year-old trap likely built by Stone Age groups for hunting reindeer. During this prehistoric period, the water level near modern-day ...
The largest gem quality stone is in the Smithsonian Museum and measures 1.5 by 3 inches. It was first described from Isle Royale, Lake Superior by C. T. Jackson and J. D. Whitney in 1847. Chlorastrolite, also known as greenstone, is the official state gem of Michigan .
A shipwreck dating back to the 5th and 6th centuries B.C. was discovered near Sicily along with ancient anchors made from stone and iron, Italian officials said. The 2,500-year-old wreck was found ...
Researchers discovered a 500-year-old compass in a hidden chamber in Frombork, Poland, possibly used by Copernicus, shedding light on his astronomical work.
Inclusions can be found in these crystals that provide clues to the origins of the Herkimer diamonds. Found within the inclusions are solids, liquids (salt water or petroleum), gases (most often carbon dioxide), two- and three-phase inclusions, and negative (uniaxial) crystals. A black hydrocarbon is the most common solid inclusion.
The 500-year-old wreckage used to carry the flag of a Scandinavian king. ... sank near Stora Ekön in 1495 after a fire broke out onboard, Stockholm University said in an April 18 news release ...