What are sun-bleached agates? Have you ever had something special set up on display in a south facing window in your home, only to find after several months, or years, you notice the bright colors it once had are now significantly lighter than you remember or compared to other areas of the object that were not in line of direct exposure? So what does this scenario have to do with the Lake Superior agates we are discussing in this post and pictured below? Pretty much the same identical thing Over time, the powerful rays of the sun have managed to bleach out or fade the colors of these agates. No one knows for certain that this is exactly what has happened to these stones, but given even the short term effects of the strength of the sun on objects we have set in our windows, think of the result millions of years of direct sunlight could have on an agate. Interesting and fun to contemplate, isn't it?