I thought calcite as well but the fracture planes donβt look quite right.  Maybe it is quartzite? I find a lot of this as river cobbles along the Columbia river in Washington.
               
            
            
                23.12.2024 00:23 β π 1    π 0    π¬ 0    π 0                      
            
         
            
        
            
            
            
            
            
    
    
    
    
            Interesting.  So maybe rhyolite with seam agate/chalcedony?
               
            
            
                16.12.2024 17:59 β π 1    π 0    π¬ 1    π 0                      
            
         
            
        
            
            
            
            
            
    
    
    
    
            Any chance you found it near Ellensburg WA?
               
            
            
                16.12.2024 00:04 β π 1    π 0    π¬ 1    π 0                      
            
         
            
        
            
            
            
            
            
    
    
    
    
            Limestone and calcite?
               
            
            
                15.12.2024 17:59 β π 1    π 0    π¬ 1    π 0                      
            
         
            
        
            
            
            
            
                                                 12.12.2024 06:46 β π 1    π 0    π¬ 0    π 0
                                                
    
    
    
    
               
            
            
                12.12.2024 06:46 β π 1    π 0    π¬ 0    π 0                      
            
         
            
        
            
            
            
            
                                                 12.12.2024 06:44 β π 0    π 0    π¬ 0    π 0
                                                
    
    
    
    
               
            
            
                12.12.2024 06:44 β π 0    π 0    π¬ 0    π 0                      
            
         
    
         
        
            
        
                            
                    
                    
                                            Amature mineral collector for 70 years.  I specialize in micro minerals and photography of them. Wife and I are also involved with llamas and we each own one. We show them at local county fairs and several ILR sanctioned shows around Washington and Oregon
                                     
                            
                    
                    
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