This piece is comprised of some very nice datolite crystals, super for their lustre, sharpness and complexity. The crystals are colourless and transparent, with rainbow-like play of light internally under the bright lights. The largest datolite crystal is 2.1 cm. The third photo is taken from the top looking down. Some small quartz crystals in association. In very good condition, some chipping. Stands perfectly for display as photographed.