It occurs as a secondary alteration product of spodumene. It was first described in 1880 for an occurrence at Branchville, Connecticut Its name was from the Greek for well concealed, for its typical occurrence embedded in albite.
US Patent Issued to Thales on July 16 for "Process for Manufacturing a Ceramic Composite Based on Silicon Nitride and ?-Eucryptite" (French Inventors)
Jul 19, 2013; ALEXANDRIA, Va., July 19 -- United States Patent no. 8,486,851, issued on July 16, was assigned to Thales (Neuilly-sur-Seine,...