Terahertz crystal tumblestone 20 to 25mm, the listing is for one. TERAHERTZ ORE The terahertz stone, an ore produced by extracting silica from sand or quartz was discovered by Japanese scientists a decade ago to have a terahertz vibration frequency which lies between that of microwaves and far infrared light on the electromagnetic spectrum with its frequency ranging from 0.1 to 30THz. Terahertz frequencies are abundant in the universe and correspond to frequencies found in our bodies and are often referred to as the Radiation of Life. Silicon compounds are the most significant component of the Earth’s crust.