Powell, WY | Home Page | Shopping Cart | Contact Us Page Obsidian, mahogany black lace slab, OR $3.00 Slabs of mahogany black lace obsidian are from Oregon. A double flow pattern of color in obsidian with black and reddish brown swirls with smoky/clear and black areas. The slab pictured is approximately 3" X 6", which means you should order three or four to get a similar slab. Remember each sample slab ordered is for 5 square inches and if you order one you will get either a partial slab or a small slab. The obsidian is very good quality which will make some beautiful cabochons. Stock 542s Related Items Here are some products that may also be of interest to you: • Rough: Obsidian, mahogany black lace