Glad to hear you are getting out and looking at what's there where ever you are!
We have been getting a lot of folks on here lately that are being confused by the variety of colors that Quartz can be stained by mineral “oxides”.  This looks like a nodule of some form of quartz that has been heavily water-worn and rounded. The dark red stains down in the cracks and crevices would be Iron Oxides, or rust. The small blue area does show negative impressions of a mineral that has eroded away. The blue color can be caused by Iron oxides with more titanium content like Ilmenite. I can't see the green well enough in the pictures, but if you really want to take a closer look at this rock you would need to clean it in Oxalic acid or Iron Out.