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Answer for the clue "Pertaining to the second most common element in the Earth's crust ", 7 letters:
silicic

Word definitions for silicic in dictionaries

Wiktionary Word definitions in Wiktionary
a. of, related to, or derived from silica

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Silicic \Si*lic"ic\, a. [L. silex, silicis, a flint: cf. F. silicique.] (Chem.) Pertaining to, derived from, or resembling, silica; specifically, designating compounds of silicon; as, silicic acid. Silicic acid (Chem.), an amorphous gelatinous substance, ...

Wikipedia Word definitions in Wikipedia
Silicic is an adjective to describe magma or igneous rock rich in silica . The amount of silica that constitutes a silicic rock is usually defined as at least 63 percent. Granite and rhyolite are the most common silicic rocks . Silicic is the group of silicate ...

Usage examples of silicic.

Chemical analysis of this plant shows the presence of an average of 17 per cent iron, 36 per cent silicic acid and 1·65 per cent phosphoric acid.

Clays are made from chemical building blocks such as silicic acid and metal ions, which are in solution in rivers and streams having been dissolved - 'weathered' —.