Technology-critical elements

Technology-critical elements (TCEs) are elements for which a striking acceleration in usage has emerged, relative to past consumption, and which are critical to emerging technologies.

Wikipedia provides a useful list:

Rare-earth elements (REEs)

In atomic order:

Light (LREEs)

  • scandium
  • yttrium
  • lanthanum
  • cerium
  • praseodymium
  • neodymium
  • promethium

Heavy (HREEs)

  • samarium
  • europium
  • gadolinium
  • terbium
  • dysprosium
  • holmium
  • erbium
  • thulium
  • ytterbium
  • lutetium

Platinum-group metals (PGMs)

  • iridium
  • osmium
  • palladium
  • platinum
  • rhodium
  • ruthenium

Other elements

  • antimony
  • beryllium
  • caesium
  • cobalt
  • gallium
  • germanium
  • indium
  • lithium
  • niobium
  • tantalum
  • tellurium
  • tungsten