(Internal # R33-59) This is a genuine Ulexite "T.V. ROCK" specimen, between 1-5/8 and 1-3/4" long. What you see in to photo is what you get. This is by far the most interesting and popular mineral we sell! "Ulexite" is a natural mineral (NaCaB5O9.8H2o) from a borax mine in Boron, California. Our specimens are straight from the mine so it's all A grade clarity. It is calcium-sodium hydrated borax. It exhibits a unique fiber-optic property - when one polished end is placed on a newspaper or picture, the capillary fibers transmit or project the picture to the top of the rock! This is NOT a transparent stone. Kids just know it's weird and wonderful! Obtained directly from a borax mine in Boron, CA where we obtained the Ulexite. Colemanite and Kernite are also mined here. WE SHIP WORLDWIDE, see the chart for postage to your country. Click on our Store tag for SIMILAR items.