slickstone
/sˈlɪkstoʊn/Definitions
1. noun
A type of sedimentary rock consisting of fine-grained silica particles, often used in the manufacture of glass.
“The ancient Romans used slickstone to create beautiful glass vessels.”
2. noun
A type of smooth or slippery rock, often found near waterfalls or streams.
“The hikers had to be careful not to slip on the slickstone near the river.”