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Dwarves' Earth Treasures Online Museum:
Ojibway Datolites
Ojibway Mine, Mohawk, Houghton Co., Michigan
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    The datolites from Ojibway Mine seem to be the recent finds, and the first datolites I saw coming from Ojibway was those with gray copper inclusions in the center, and I tried to find those datolies with no success until I explored one side where I found one datolite nodule just when the sun was setting. So I came back to that area the next day, and found one more! Those two were in plain sight and caked with mud. Later, I would find another big one with so much copper in it. It turned that those with pink dots may be rarest of any datolites coming from Ojibway Mine.

Typical datolite with with copper inclusions (bought)
Plenty of pink dots in this one(rare??).
Found by JeffreyA., August 2005
Rimmed with copper,
Found by JeffreyA., August 2005

Supposedly very rare find (according to the datolite hunters). Very rich in copper inclusions.
Found by JeffreyA., August 2007