Mahogany double flow obsidian rough is from OR. (Stock 549) Very beautiful patterns of black and reddish brown (mahogany) are found in the rough obsidian when it is slabbed. With proper orientation, gold sheen may be found as well. Some areas may contain a blace lace pattern (black swirls) with black to smoky swirls when slabbed. The contrast of the mahogany and black coloring is great for interesting cabochons. Slab thin for interesting rock panels for lamp shades and more. See a sample slab of mahogany double flow obsidian. Sizes available in the rough are from 1-15 pounds plus. The retail price listed is $3.00 per one pound.