Felsic

Felsic is a term used in geology to refer to silicate minerals, magmas, and rocks which are enriched in the lighter elements, such as silica and oxygen, aluminum, and potassium. The term combines the words "feldspar" and "silica."

Felsic minerals are usually light in color and have specific gravities less than 3. Common felsic minerals include quartz, biotite, muscovite mica, hornblende and the orthoclase feldspars. The most common felsic rock is granite.

On the opposite side of rock spectrum are "mafic" rocks.

Rock Texture	Name of Felsic Rock
Pegmatitic	Granite pegmatite
Coarse grained (phaneritic)	Granite
Coarse grained and porphyritic	Porphyritic granite
Fine grained (aphanitic)	Rhyolite
Fine grained and porphyritic	Porphyritic rhyolite
Pyroclastic	Rhyolitic tuff or breccia
Vesicular	None
Amygdaloidal	None
Many small vesicles	Pumice
Glassy	Obsidian

See also: List of minerals