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CUSTOMER AGATE FINDS

December 2017

The lack of ice flow on Lake Superior this past winter and spring definitely impacted the quality of agate hunting along the shoreline over the summer. Despite fewer agates being found, people still brought some nice agates into the museum.

This first Lake Superior agate was found mid-August by Ann Blanchard, who is from Port Washington, WI.

Cassie Bogotka sent me an email with photos of coldwater agate. It is a marine sedimentary agate  mostly formed in Devonian age limestone, which is 416 to 358 million years old.  This agate is significantly different than the 1.1 billion year old Lake Superior agate that formed in igneous basaltic rock. Although interesting, coldwater agate has little to no value.

A nicely banded Laker was found by my friend, Claudia, at the end of the season. She and her husband stay in Woodland Park most of the summer.

Adrian Gauthier, from Cheboygan, MI, brought these two beautiful agates into the museum in July. The agate on the left is a beautiful water-washed agate. The other is an unusual brecciated agate.

Margaret Kline visited the museum in August. She found the specimens shown below during the 1960s and 1970s. The first picture is Keweenaw prehnite. The other specimens are Lake Superior agates.

I received several emails from Keweenaw seasonal resident, David Schuder. The first is an usual Lake Superior agate found near Eagle Harbor. The green, he says, is Celandonite. The second Laker contains several crystal impressions (the original crystals either popped out or wore away). The third photo he describes as a “hematite plume-like agate,” which was collected at the Calumet & Hecla # 21 Copper mine in Houghton County.Mi.



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Gitche Gumee Museum.
E21739 Brazel Street
Grand Marais, Michigan 49839

 


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