siliceous
/sɪˈlɪʃəs/
adjective
- Containing or made of silica, especially describing rocks, minerals, or materials.
- The soil in that region is highly siliceous, which affects what plants can grow.
- Siliceous rocks like flint were used by early humans to make tools.
- Some sponges have a siliceous skeleton made of tiny glass-like spikes.