earthstory: Fairburn fortifications The state gemstone of South Dakota is one of the most beautiful
earthstory:Fairburn fortificationsThe state gemstone of South Dakota is one of the most beautiful agates on Earth, with lovely banding patterns and (in the best specimens) bright red, orange and brown colours due to iron oxides. Named after the town nearest to where it occurs, it is a target for rockhounds across the country (see http://on.fb.me/16fsEEt). They were first discovered in the late 19th century, though native peoples had known of them since time immemorial. Keep reading -- source link
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