the.com/beryllium
the spacecraft metal so toxic that breathing its dust can kill your lungs decades later
transparent to X-raysused as windows in X-ray machines
lighter than aluminumyet stiffer than steel by weight
gemstone familyemeralds and aquamarine are beryllium crystals
webb telescopeits 18 mirrors are gold-coated beryllium
chronic diseaseinhaled dust causes incurable berylliosis