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'''Silicic''' is a term used to describe [[magma]] or [[igneous]] rock rich in [[silica]]. The amount of [[silica]] that constitutes a silicic rock is usually said to be at least 65 percent. [[Granite]] and [[rhyolite]] are typical silicic rocks.
'''Silicic''' is a term used to describe [[magma]] or [[igneous]] rock rich in [[silica]]. The amount of silica that constitutes a silicic rock is usually put at at least 65 percent. [[Granite]] and [[rhyolite]] are typical silicic [[Rock (geology)|rocks]].


Silicic is the group of silicate magmas which will eventually crystallise a relatively small proportion of ferromagnesian silicates, such as amphibole, pyroxene, and biotite.
Silicic is the group of silicate magmas which will eventually crystallise a relatively small proportion of ferromagnesian [[silicate]]s, such as [[amphibole]], [[pyroxene]], and [[biotite]].

Rocks containing more than 66% silica are silicic.


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[[Category:petrology]]

Revision as of 19:56, 30 January 2008

Silicic is a term used to describe magma or igneous rock rich in silica. The amount of silica that constitutes a silicic rock is usually put at at least 65 percent. Granite and rhyolite are typical silicic rocks.

Silicic is the group of silicate magmas which will eventually crystallise a relatively small proportion of ferromagnesian silicates, such as amphibole, pyroxene, and biotite.