Five square inches of silver sheen obsidian from NV. Brilliant silver sheen on black background. This material is the finest silver sheen we have ever seen. Cabochons will be fantastic! When slabbing silver sheen obsidian rough, orient the rock so that the flat lay of the inclusions is parallel with the slab cut. The obsidian appears black in the rough, but when oriented properly you will end up with a polished specimen as shown in the picture. Stock 557s.