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Definition of silicic

i. In petrology, containing silica in dominant amount.

ii. In chemistry, containing silicon as the acid-forming element.

iii. Said of a silica-rich igneous rock or magma. Although there is no firm agreement among petrologists, the amount of silica is usually said to constitute at least 65% or two-thirds of the rock. In addition to the combined silica in feldspars, silicic rocks generally contain free silica in the form of quartz. Granite and rhyolite are typical silicic rocks. The synonymous terms 'acid' and 'acidic' are used almost as frequently as silicic.

Synonym of: acidic, intermediate, persilicic

Compare with: basic, ultrabasic

Ref: AGI
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