Double flow or banded obsidian from Montgomery Pass, NV is a unique obsidian with translucent gray/black and thin opaque bands of black obsidian running parallel which gives the appearance of looking through a Venician blind. As noted in the image shown, the parallel banding is easily seen for proper orientation for sawing. (Stock 543) Laminate thin slabs together for fantastic patterns. Sizes are from 1/2-3 pounds each. Price listed is for one pound.