Siliceous (adjective)

1. Relating to or containing silica.
2. Resembling flint or glass in texture or hardness.

Origin:

From the latin word "silicis" meaning "silica" or "flint".

Examples:

1. The soil is rich in siliceous minerals.
2. Siliceous rocks are composed of silicon dioxide.
3. The siliceous sands on the beach glistened in the sun.
4. The siliceous spicules in the sponge's skeleton are very hard.
5. The siliceous nodules in the rock were formed by precipitation of silica.