1. A fine-grained metamorphic rock formed by the action of heat on clay rocks
   - hornfels

Derived forms: hornstones

Type of: metamorphic rock

Encyclopedia: Hornstone

• steel engraving
• steel factory
• steel gray
• steel grey
• steel guitar
• steel industry
• steel mill
• steel oneself against
• steel oneself for
• steel plant
• steel plate
• steel production
• steel trap
• steel wool
• steel-plated
• steel-wool pad
• Steele
• steelhead
• steeliness
• steelmaker
• steelman
• steelworker
• steelworks
• steely
• steelyard