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How to Find Superior Agates

Superior agates are richly colored semi-precious gemstones found near Lake Superior and any water that empties into it, including the Mississippi River.
Each Lake Superior agate is unique with its own banding pattern and color. These gemstones are formed when liquid quartz fills an empty pocket in another rock layer by layer.
The official state stone of Minnesota,Lake Superior agate is distinguished from other agate by the red, orange, and yellow colors that are caused by oxidized iron.
Experienced rock collectors can find many good specimens, but you may need to search several times to find what you are looking for.

Things You'll Need

  • Comfortable walking shoes
  • Bag
  • Sunshine
  • Gloves
  • Spray Bottle
  • Flashlight
  • Knife
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Instructions

    • 1
      Dress in warm layers of clothing to search for Superior agate.

      Dress in sturdy, comfortable walking shoes and wear warm layers of clothing.
      Searching for Superior agate involves walking, climbing, stooping, and bending in a climate that can be chilly even on sunny days.
      Wearing layers allows you to remove garments if you get too warm.

    • 2
      Look for Superior agate on sunny, early spring days.

      Bring a bag to put rock specimens in.
      Visit beaches along Lake Superior early on sunny mornings or late in the afternoon.
      Look along the shoreline early in the spring when the ice is melting and new rocks are deposited in the shallow water near the shore or after a storm when new rocks wash ashore.
      Squat low to the ground looking into the sun so you can see the translucent glow that distinguishes Superior agate from other rocks.
      Wear gloves to protect your hands when handling rocks. Use the same technique on the edges of inland rivers and in creek beds.

    • 3
      Look for the colors and patterns of Superior Agate in rocks found in mines and gravel pits.

      Seek permission to look in mines and gravel pits for Superior agate.
      Shine a flashlight on rocks to find the soft glow and banding patterns that identify Superior agates.
      Spray rocks with water to bring out the colors and patterns. You usually can find more specimens in gravel pits after a windstorm.

    • 4
      Superior agate is harder and heavier than other rocks of the same size.

      Lift pitted rocks of the same size that have a surface similar to potato skin.
      Superior agate is heavier than most other rocks.
      Scratch the glossy, waxy area on the chipped surface of a rock with a knife blade. Superior agate is too hard to scratch.

    • 5
      Look for rust-red or yellow stains to identify Superior agate.

      Some Superior agates have been found along railroad tracks and alongside roads in construction areas.
      Look for rust-red or yellow stains, banding patterns, and broken rocks with a smooth natural surface.

    • 6
      Rock shops and museums have many specimens of Lake Superior agate.

      Visit rock shops and museums that line Lake Superior.
      Most of them offer classes, rock collecting guides, tours, and maps that lead you to Superior agates.
      They also may have many specimens for sale if your search is not successful.

    • 7
      Look for Superior agate in sand bars while scuba diving in Lake Superior.

      Scuba dive in Lake Superior to look for Superior agate on sand bars.
      Visit the states Lake Superior was distributed in, including Upper Michigan, Wisconsin, Minnesota, and Iowa.


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