Silicon Carbide was the initial commercially vital semiconductor material. A crystal radio "carborundum" (artificial silicon carbide) detector diode was patented by Henry Harrison Chase Dunwoody in 1906. It identified Substantially early use in shipboard receivers. He called the blue crystals that formed carborundum, believing it being a brand new compound https://eduardoqrpnm.myparisblog.com/36410480/new-step-by-step-map-for-what-color-is-alumina