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Fordite, also known as Detroit agate, Motor City agate, [1] paint rock, or paint slag, [2] is a lapidarist term for polished pieces of finely layered paint masses from automobile factories. The masses consist of automotive paint which has hardened sufficiently to be cut and polished.
The gas pockets in which the agates formed were primarily small, about 1 cm in diameter. A few Lake Superior agates have been found that are 22 cm in diameter with a mass exceeding 10 kilograms. Very large agates are extremely rare. The most common type of Lake Superior agate is the fortification agate with its eye-catching banding patterns ...
Name County Years Material Coordinates Adventure mine: Ontonagon: 1850–1920: copper: Alabastine Mine: Kent: 1907– gypsum: Arcadian mine: Houghton: 1898–1908: copper
Isle Royale geologic map Cross-section of the Lake Superior basin showing the tilted strata of volcanic rock that form Isle Royale. The island is composed largely of ridges, running roughly southwest-to-northeast. The main ridge, Greenstone Ridge, is over 1,000 ft (300 m) in many places.
Brecciated agates have also had their bands broken apart and re-cemented with chalcedony, but they consist of disjointed band fragments at random angles. [9] [10] They are a form of breccia, which is a textural term for any rock composed of angular fragments. [10] [11] Eye agates have one or more circular, concentric rings on their surface. [12]
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Agate is an unincorporated community on M-28, about eight miles east of Bruce Crossing. Agate Falls Scenic Site. on the middle branch of the Ontonagon River is nearby. It was originally known as Agate Siding, after the spur from the Duluth, South Shore and Atlantic Railway (now the Soo Line Railroad) created in about 1890 to serve nearby mining operations.
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