
            
            By: magic-gigapans
            
              Image: Callan Bentley, Mid-Atlantic Geo-Image Collection
                
            
            
              License:
                 Creative Commons Non Commercial ⧉
              
            
          
            Uploaded: 20 Apr 2020
            Last Updated: 26 May 2020
          
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~North/south trending dike of bluish-colored felsite cross-cutting Devonian pink granite, Ronas Hill, Shetland. Neolithic people favored these dikes for their ceremonial "Shetland knives" because of the spherulitic texture to be seen along the margins of the dike.