Large (450 gramms total weight) rough/rubbed Boulder Opal Sandstone PARCEL. 23 pieces to play with .Sizes range from 12-65 mm (appr.). This sandstone/Gem crystal pipe material is very rare.. The crystal pipes go through the complete stone ..so useable for cutting ringstones or for pendants.. Each piece has color . Some of this sandstone pipes have cracks. see video and Pictures. .. Brilliant golden/orange/red -green-blue-purple pattern/Colorplay. You have to hold this opal in your hands to see the fascinating colorplay. Video is a bit too dark and shows the blues too bright.. .Rough opals always have inclusions and cracks, For returns: sealed bag must be unhurt/closed