Ulexite crystals TV stone RARE 3 piece lot (three) crystals California For Sale

Rare crystal ulexite,from California, commonly known as TV stone due to the crystals ability to transmit images,like the printing in the picture here ,from the backside to the front side hence appearing like a TV screen,,much like fiber optic technology..Each buyer will receive 3 stones scooped from stones as pictured,,the picture shows several crystals so you can see various shapes and the optical properties,, with the stone size running approximately 1 1/4 to 2 inch wide and long by 1/2 inch deep.Ulexite(NaCaB5O6(OH)6•5(H2O)) (hydrated sodium calcium borate hydroxide), sometimes known asTV stone,occurs insilkywhite rounded crystalline masses or in parallel fibers. The natural fibers of ulexite conduct light along their long axes, by internal reflection.Ulexite is a structurally complex mineral, with a basic structure containing chains of sodium, water and hydroxide octahedra. The chains are linked together by calcium, water, hydroxide and oxygen polyhedra and massive boron units.Ulexite is also known asTVrock due to its unusual optical characteristics. The fibers of ulexite act asoptical fibers, transmitting light along their lengths by internal reflection. When a piece of ulexite is cut with flat polished faces perpendicular to the orientation of the fibers, a good-quality specimen will display an image of whatever surface is adjacent to its other side.The fiber-optic effect is the result of the polarization of light into slow and fast rays within each fiber, the internal reflection of the slow ray and the refraction of the fast ray into the slow ray of an adjacent fiber.An interesting consequence is the generation of three cones, two of which are polarized, when a laser beam obliquely illuminates the fibers.These cones can be seen when viewing a light source through the mineral.This crystal brings focus and clarity to tasks as well as understanding and vision to interpersonal relationships.