siliceus
Could not find silicea in Logeion dictionaries.
silicea Adjective: feminine nominative singular, Adjective: neuter nominative plural, Adjective: feminine vocative singular, Adjective: neuter accusative plural, Adjective: neuter vocative plural, Adjective: feminine ablative singular of siliceus
sĭlĭcĕus, a, um, adj. [silex],
- of flint or limestone, silicious: saxa, Vitr. 8, 3 fin.: lapides, Cato R. R. 18, 3.—Trop.: cor, Laev. ap. Gell. 19, 7, 10.
siliceus, a, um (silex), aus Kiesel, Kiesel-, saxa, Vitr. 8, 3, 19: lapides, Cato r. r. 18, 3 codd. (Schneider lapides silices).
sĭlĭcĕus, a, um, de silex : Cato Agr. 18, 3 ; Vitr. Arch. 8, 3, 19 || [fig.] quis tam siliceo (est) ? Læv. d. Gell. 19, 7, 10, qui est assez dur ? [siliceum n. , nature siliceuse] ; v. siliceo.