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Chalcedony from Midcontinent Rift, USA

08818620017056517286701.jpg
Eye Agate

Dakota County, Minnesota, USA
01725160017056422503804.jpg
Agate, etc.

Wolverine No. 2 shaft, Wolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA
02719060017055898113790.jpg
Chalcedony, etc.

No. 21 shaft, Calumet & Hecla Mine, Calumet, Calumet Township, Houghton County, Michigan, USA
01178360014960850116229.jpg
Agate, etc.

Wolverine No. 2 shaft, Wolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA
00150940017055913482681.jpg
Eye Agate

Dakota County, Minnesota, USA
06296840017055898192279.jpg
Agate, etc.

Wolverine No. 2 shaft, Wolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA
02719060017055898113790.jpg
Chalcedony, etc.

No. 21 shaft, Calumet & Hecla Mine, Calumet, Calumet Township, Houghton County, Michigan, USA
05604490014977887586458.jpg
Agate, etc.

Wolverine No. 2 shaft, Wolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA
02467900017056635956089.jpg
Eye Agate

Dakota County, Minnesota, USA
01725160017056422503804.jpg
Agate, etc.

Wolverine No. 2 shaft, Wolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA
09558780017055898318997.jpg
Chalcedony, etc.

No. 21 shaft, Calumet & Hecla Mine, Calumet, Calumet Township, Houghton County, Michigan, USA
08986820014977032851688.jpg
Agate, etc.

Wolverine No. 2 shaft, Wolverine Mine, Wolverine, Calumet Township, Houghton County, Michigan, USA
USA
 
  • Iowa
[var. Agate] Paul J.Horick (1974) The Minerals of iowa
Iowa Geological Survey Educational Series 2
    • Butler County
[var. Agate] Smith, Arthur E., Prior, Harold L. (2002) Iowa Mineral Locality Index. Rocks & Minerals, 77 (6) 404-413 doi:10.1080/00357529.2002.9924893
    • Floyd County
[var. Agate] Smith, Arthur E., Prior, Harold L. (2002) Iowa Mineral Locality Index. Rocks & Minerals, 77 (6) 404-413 doi:10.1080/00357529.2002.9924893
    • Franklin County
Smith, Arthur E., Prior, Harold L. (2002) Iowa Mineral Locality Index. Rocks & Minerals, 77 (6) 404-413 doi:10.1080/00357529.2002.9924893
    • Hamilton County
[var. Agate] MacFall, P.M. (1951) Gem Hunter's Guide (1st ed.). Science and Mathematics Publishing Company, 187 pages.
    • Hardin County
Smith, Arthur E., Prior, Harold L. (2002) Iowa Mineral Locality Index. Rocks & Minerals, 77 (6) 404-413 doi:10.1080/00357529.2002.9924893
Smith, Arthur E., Prior, Harold L. (2002) Iowa Mineral Locality Index. Rocks & Minerals, 77 (6) 404-413 doi:10.1080/00357529.2002.9924893
    • Marshall County
[var. Agate] Rocks&Min. 20:480.
    • Montgomery County
[var. Agate] Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row.
    • Story County
Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row.
  • Kansas
Kenneth L. Walters and Charles K. Bayne, Geology and Ground-water Resources of Clay County, Kansas, Kansas Geological Survey Bulletin 136, 1959.
[var. Agate] Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row.
  • Michigan
    • Alger County
[Agate var. Lake Superior Agate] Yalmer Primeau collection
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
      • Pictured Rocks National Lakeshore
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
    • Chippewa County
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
    • Gogebic County
      • Black River Harbor
[Agate var. Lake Superior Agate] Brian Cowger
    • Houghton County
      • Calumet Township
        • Calumet
          • Calumet & Hecla Mine
[var. Agate] Rosemeyer, T. 2011 New from the Keweenaw: Part 4 - Recent Mineral Finds in Michigan's Copper Country. Rocks & Minerals 86:205-227
[var. Agate] Yalmer Primeau collection
        • Wolverine
[var. Agate] Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row.
[var. Agate] Rosemeyer, T. (2011) New from the Keweenaw: Part 4 - Recent Mineral Finds in Michigan's Copper Country. Rocks & Minerals: 86(3): 205-227
Rosemeyer, T. (2007) The Kearsarge: Copper-bearing Amygdaloidal Lode. Houghton and Keweenaw Counties, Michigan. Rocks & Minerals: 82(4): 276-297.
      • Hancock
[var. Agate] Yalmer Primeau collection
      • Osceola Township
[var. Agate] Larry Maltby, based on recent collecting by Tom Rosemeyer at the La Salle Mine.
      • Schoolcraft Township
[var. Agate] Yalmer Primeau collection
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
    • Keweenaw County
      • Allouez Township
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Yalmer Primeau collection
        • Mohawk
          • Mohawk Mine
[var. Agate] Yalmer Primeau collection
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[Agate var. Lake Superior Agate] Brian Cowger
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
      • Eagle Harbor
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Paul Brandes field observation
[var. Agate] Yalmer Primeau collection
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
Larry Maltby
      • Grant Township
        • Bete Grise
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Bornhorst, T.J., Rose, W.I. (1994) Self-guided geological field trip to the Keweenaw Peninsula, Michigan. Field Trip Guidebook. Institute on Lake Superior Geology Annual Meeting, Houghton, Michigan: 40(2). 185 pages.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Yalmer Primeau collection
[var. Agate] Paul T. Brandes
      • Houghton Township
        • Eagle River
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
      • Isle Royale National Park
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
    • Luce County
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
    • Marquette County
      • Marquette
Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
    • Ontonagon County
[var. Agate] MacFall, P.M. (1951) Gem Hunter's Guide (1st ed.). Science and Mathematics Publishing Company, 187 pages.
      • Ontonagon
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
      • Rockland
Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
      • White Pine
[var. Agate] Heinrich, E. W., Robinson, George Willard (2004) Mineralogy of Michigan (2nd ed.) A.E. Seaman Mineral Museum and Michigan Technological University. 252pp.
  • Minnesota
[Agate var. Lake Superior Agate] Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row.
      • Tofte
[Agate var. Lake Superior Agate] Brian Cowger
[Agate var. Lake Superior Agate] Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row.
[Agate var. Lake Superior Agate] Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row.
    • Lake County
[Agate var. Lake Superior Agate]
[var. Agate] Ojakangas, R. W. and Matsch, C. L. (1982): Minnesota's Geology. U of Minnesota Press. 255p
[var. Agate]
[var. Agate] Green, J. C. (1987). Plateau basalts of the Keweenawan North Shore Volcanic Group. Geol. Soc. Am. Centennial Field Guide—North-Central Section, 59-62.
Ojakangas, R. W. and Matsch, C. L. (1982): Minnesota's Geology. U of Minnesota Press. 255p
[var. Agate] Roadside Geology of Minnesota (2009) Ojakangas, R.W.
[Agate var. Lake Superior Agate] Ransom, Jay Ellis (1974) Gems and Minerals of America - A Guide to Rock Collecting. Harper & Row.
    • Pine County
[var. Agate] Yalmer Primeau collection
    • St. Louis County
      • Duluth
[Agate var. Lake Superior Agate] Brian Cowger
  • Nebraska
    • Cass County
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
    • Gage County
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
    • Johnson County
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
    • Lancaster County
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
    • Nemaha County
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
    • Otoe County
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[var. Moss Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[var. Agate] MacFall (1975) Gem Hunter's Guide
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
    • Saline County
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
    • Saunders County
[var. Agate] MacFall (1975) Gem Hunter's Guide
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
    • Seward County
[Agate var. Lake Superior Agate] Pabian, Roger K. (1971) The Minerals and Gemstones of Nebraska. Educational Circular 2. University of Nebraska - Conservation and Survey Divsion
  • Wisconsin
    • Ashland County
      • Ashland
[Agate var. Lake Superior Agate] Brian Cowger
    • Bayfield County
      • Bayfield
[Agate var. Lake Superior Agate] Brian Cowger
    • Douglas County
[var. Agate] Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078
[var. Agate] Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078
      • South Range
[var. Agate] Cordua, W.S. (1990), Amygdule Minerals of the South Range Quarry, Douglas County, Wisconsin: Rocks and Minerals: 65: 412-415. 

Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078
    • St. Croix County
[var. Agate] William S. Cordua collection
      • Hudson
[var. Agate] Cordua, William S. (1998) Wisconsin Mineral Locality Index. Rocks & Minerals, 73 (6) 378-399 doi:10.1080/00357529809603078
 
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