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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.
Lake Superior agate: Found in the northeastern and north central parts of Minnesota, the Lake Superior agate consists of quartz blended with the red and orange effects that come from soil rich in iron ore. [16] 1969 Grain: Wild rice (Zizania palustris)
Montana Agate (1969) Nebraska [45] Prairie agate (1967) Blue chalcedony (1967) Nevada [46] [47] Metal: Silver (1977); Nevada's nickname is the Silver State: Sandstone (1987) Precious Gemstone: Virgin Valley black fire opal (1987) Semiprecious Gemstone: Nevada turquoise (1987) New Hampshire [48] Beryl (1985) Granite (1985); New Hampshire's ...
Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...
The Minnesota state gem, the Lake Superior agate, can be found on the shores of Lake Superior, in the streams that run into it, and in gravel pits and road cuts. Duluth's Park Point is an excellent area for hunting, as shorelines and beaches are replenished each year because winter ice and storms push new material up on the shores.
The sandstone has been variously called redstone, brownstone, Lake Superior Sandstone, and Eastern Sandstone. In 1907, the Jacobsville Formation was given its current classification and the name Jacobsville , in honor of Jacobsville, Michigan , a town known for its production of the sandstone.
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A form of cryptocrystalline quartz that is regarded as a semiprecious gemstone, agate is found in several areas in the state. [1] Collecting localities are found in Hawkins County (golden tone agate), Greene County (agatized oolites ), Bedford County (carnelian, blue, ivory, pink, finely banded, dendritic, moss, iris and Fairburn style agate ...
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