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

• Saxifraga sarmentosam
• Saxifraga stellaris
• Saxifraga stolonifera
• Saxifragaceae
• saxifrage
• saxifrage family
• saxist
• saxitoxin
• Saxo Grammaticus
• Saxon
• Saxon blue
• family Ramphastidae
• family Ranidae
• family Ranunculaceae
• family Rapateaceae
• family Raphidae
• family Raphidiidae
• family Recurvirostridae
• family Reduviidae
• family Regalecidae
• family relationship
• family Resedaceae
• family Rhamnaceae
• family Rheidae
• family Rhincodontidae