Hi, based on the picture alone, could be native Bismuth - though there are not a lot of places to find it occurring naturally (only one I know of is really hot ground and hard to hunt with a CW machine). Mineral identification kits sometimes come with some. Take it to your local University, and if they can't ID it by sight/scrape, then they can LIBS it. Laser-Induced Breakdown Spectroscopy. Or, turn your toilet lid over, scrape it (note the streak color), and then go to mindat.com and try to ID it with their excellent tool.