So a lot of times after I burn off the Pirates and sulfides in my concentrates pan them out I will notice this line of white material. It acts just like black sand and even heavier than Blacksand sometimes. When I look at it under a eye loupe it appears to be grains of sand but that doesn't really make sense it seems it would wash away really easy. So I'm just wondering does burning off the sulfites and pyrites perhaps turn some of the Blacksand into a white color depending on what it was coated with. That kind of doesn't make sense either because it does look like just a basic white sand crystals. Any help would be great thanks