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Mineral Specimen #648    Lake Superior Agate

Brockway Mountain, Keweenaw County, Michigan, USA

This is an extremely large Lake Superior Agate which has been cut and polished. Most Lake Superior Agate are found after they have weathered from the basalt in which they form. This specimen was extracted from a seam in the basalt (at this location this is usually at the contact zone where a sedimentary conglomerate overlays the basalt). It was collected from the north slope of Brockway Mountain. Brockway Mountain forms a spine-like ridge in the middle of the Keweenaw Peninsula. It exhibits the peach like color for which agates from this location are noted.


9.8x4.2x7.2 x 10.1x4.1x6.2 x cm

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This mineral is also found in the following galleries: Minerals From Michigan | Quartz | Polished & Worked | Minerals Priced Between 100 and 199 Dollars
This mineral is also found in the following galleries: Minerals From Michigan | Quartz | Polished & Worked | Minerals Priced Between 100 and 199 Dollars