29 ct slab rough Louisiana opal  Vernon parish La. Monks Hammock area also called Hidden fire mine— This mine has been closed since 1993 Quartzite is the main material the opal is in . I got these pieces from a friend of mine who lives in Vernon parish and one of the few miners that mined this in the early 1980s  buyers pays shipping please checkout all the great auctions from My Booth Rocks rock shop Jasper TX any questions email me  look at pics and video for complete rock specimen— blue and purple 1” by 7/8”