Silex
Pronunciation : Si"lex
Part of Speech : n.
Etymology : [L., a finit, a pebblestone.] (Min.)
Definition : Defn: Silica, SiO2 as found in nature, constituting quarz, and most sands and sandstones. See Silica, and Silicic.
Source : Webster's Unabridged Dictionary, 1913