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Datolites of Michigan
Updated August 2022
   Datolite almost always come in the form of crystals, and there is only two places in the world where the datolites come in form of porcelianlike solid nodules; the copper ore regions of  the Upper Peninsula of Michigan and Northern Shore of Minnesota. Such datolite nodules are commonly white, but some of them come in a variety of colors that make them even rarer and more desirable. They almost always come in small sizes, from marbles to baseballs and I have seen few specimens as big as basketballs at Seaman Mineralogical Museum at Mich. Tech. University in Houghton, Michigan.

  Important Notice regarding rockhounding the copper mine dumps. A number of mine dumps have been sold as private properties resulting in the uncertainly of collecting privileges. Some places may be subject to Commerical Forest Act. It's best to contact the Copper Country Rock Club for updates regarding the collecting sites.

 .[What is Datolite and What Does They Look Like?]
 .[Rainbow of Datolites]

 Houghton County:
   [Arcadian Mines]
   [Centennial #2 Mine]
   [Franklin]
  .[Isle Royale Mine]
   [Laurium & LaSalle Mines]
   [Mensard]
   [Ojibway]
   [Quincy, (colored)]
   [Quincy, (white types)]
  .[Saint Lo Mine]
  .[Wolverine #2 Mine]
  .[Winona Mine]
  .[Other Rare Locations of Houghton Co.] 

 Keweenaw County:
  .[Central & Central Exploratory Mines]
  .[Clark Mine]
  .[Clark Swamp Adit datolites]
   [Copper Falls Mine]
   [Connecticut Mine]
  .[Delaware Mine]
  .[Delaware Mine (dug from the mine piles)
  .[Drexal Mine]
   [Hill Creek Fissure (behind Copper Falls Rest Area)]
  .[Iron City(Empire)]
   [Iroquois Mine]
   [Keweenaw Point and Highrock bay]
   [Mine Pits of Isle Royale]
  .[Montreal & Cape Mines]
  .[Mandan Pit]
  .[Phoenix & Robbins(West) Vein Mine]
  .[Shores of Lake Superior especially Isle Royale]
   [South Cliff] 
   [Star Mine] 
  .[Wyoming (Bluff) Exploratory Mine] 

   [Datolites from Rare Locations of Keweenaw C. 

 Ontonagon County:
 ..[Adventure Mine] 
...[Caledonia & Kowlton Mine]
 ..[Caledonia Mine (Datolites found by JeffreyA.)]
   [Lake Mine]
   [Nassau/Flintsteel Mine]
   [Mass Mine]
   [Other Mines]
       Includes Ridge, Minesota, Evergreen, Aztec, Superior, Victoria, Oneida, Michigan S & C National,

    [Northern Shore of Minnoseta]

- Kamloops "datolites" (actually silicified clay aggregates)   
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