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Dwarves' Earth Treasures Online Museum:

Datolites of Houghton Co.
Rare Locations of Houghton Co., Michigan

Datolites from rare locations. The datolites tend to be sparse in many mines, but they show that they can be found in unexpected places.

  You can click on the pictures to see larger pictures.

datolite datolite
St. Louis Mine, Calumet, 
Houghton Co., Michigan
(may be mislabeled)
Ahmeek Mine,
Ahmeek, Houghton Co., Michigan

datolite datolite
Old Superior Mine,
Houghton Co., Michigan
Osceola Shaft #4
Only one found so far.
The other half is included A.C.
Seaman Mineralological Museum's
collection as confirmed by
Christopher J. Stefano.