1. Colourless glass made of almost pure silica
   - quartz glass, quartz, lechatelierite, crystal

Type of: natural glass

• unlikely
• unlikeness
• unlimber
• unlimited
• unlined
• unlink
• unlipped
• unlisted
• unlisted security
• unlisted stock
• unlit
• unliterary
• unlittered
• unlivable
• unlive
• unliveable
• unliveried
• unload
• unloaded
• unloading
• unlobed
• unlocated
• unlock
• unlocked
• unlogical