Ancient Technology in Stones

I read a lot about civilizations from prior to the great flood and the real age of the Pyramids. I have also been looking into the Ancient Sumerians. One post on You Tube showed what was said to be alien (Ancient) Data found on a 250 year old Micro Chip. It is on Mystery History on You Tube.
When I bought my home the previous owner had edged some of the paths with small round pebbles. These were given to her by her son who had worked somewhere where pebbles were used in a grinding process and the left over stones were discarded when they had worn smooth. I have been selling the stones in 2 Kg parcels on eBay as they are ideal for Aquariums, Display or flower vases. When I was sorting out a recent lot I came across one natural stone with parallel white lines in it. The stone is genuine and the lines are straight and embedded. Perhaps they too are left over from some ancient artifact as I cannot think they are natural. I will be interested to hear comments.