China Sand, White, Natural, FreeShip.
This is mostly a natural crystalline quartz sand. It is white or transparent depending on "fluid inclusions" (in the white quartz). It will be off-white when less than "pure" (100% pure in the real world is 99% (or 95%?) to 99.9%). It would be a microcrystalline silica sand if it were technically a silica sand. It's called "Sierra White China Sand". It's not even close to being a pure silica sand. But it is close to white (it's whiter than it looks in the picture). We have some pure silica that's a high refractory, made from pure electric arc furnace melted crystalline quartz which changes it into an amorphous silica (not a natural form of silica and it's expensive). I think that adding some of this to a porcelain body to give it a little grogy "tooth" might be worth trying (if it stays white)....(see more)