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Green starstone is most common in Michigan's Upper Peninsula. Greenstone or Isle Royale greenstone and Lake Superior greenstone. Turtle back is a name sometimes given because of the overall pattern, particularly in polished pieces, which roughly resembles that of a turtle shell. Uigite is a variety found on the island of Skye off the coast of ...
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
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A Petoskey stone is a rock and a fossil, often pebble-shaped, that is composed of a fossilized rugose coral, Hexagonaria percarinata. [1] Such stones were formed as a result of glaciation, in which sheets of ice plucked stones from the bedrock, grinding off their rough edges and depositing them in the northwestern (and some in the northeastern) portion of Michigan's lower peninsula.
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Metamorphosed pillow lava from the Ishpeming Greenstone Belt in Michigan. Greenstone belts have been interpreted as having formed at ancient oceanic spreading centers and island arc terranes. Greenstone belts are primarily formed of volcanic rocks, dominated by basalt, with minor sedimentary rocks inter-leaving the volcanic formations.
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