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

• genus Baphia
• genus Baptisia
• genus Barbarea
• genus Barosaurus
• genus Bartle-Frere
• genus Bartramia
• genus Basiliscus
• genus Bassariscus
• genus Bassia
• genus Bathyergus
• genus Batis
• genus Batrachoseps
• genus Bauhinia
• genus Beaumontia
• genus Begonia
• genus Belamcanda
• genus Bellis
• genus Bemisia
• genus Bennettitis
• genus Benzoin
• genus Berberis
• genus Bergenia
• genus Beroe
• genus Berteroa
• genus Bertholletia