Possible Clues:

• Component of TV screen adapted as lamp
• Deposit in some banks
• Colourless fluid in blood; green variety of quartz
• Fluid a palm's spilling
• TV-screen material
• Colourless fluid in which blood cells are suspended
• A palm's analysed to reveal what's in the blood
• Element in start of 18 across to bully pal's mother
• "The fourth state of matter"
• Fading TV type