What does "felsic" mean?

Answer

The term "felsic" is used in geology to refer to igneous rocks that are rich in elements that form quartz and feldspar, such as sodium, potassium, magma and oxygen. The term combines two words: "feldspar" and "silica." Felsic rocks are light in color, and a good example is granite.

Felsic rocks contain more than 75 percent felsic minerals, namely plagioclase, orthoclase and quartz. This is a requirement in order for a rock to be classified as a felsic. Rocks that have more than 90 percent felsic materials are referred to as leucocratic. Felsic minerals are rich in silicon, potassium, sodium and aluminum; they are commonly pink, white or light grey.

Q&A Related to "What does "felsic" mean?"
Felsic is igneous rocks consisting mainly of feldspars, feldspathoids, quartz, and other
http://www.chacha.com/question/what-is-felsic
Felsic magmas are very light colored because they contain 0 to 15% mafic crystals. They are made up of muscovite, quartz, potassium feldspar, and very little plagioclase feldspar,
http://wiki.answers.com/Q/Where+can+felsic+magma+b...
(fĕl'sĭk) adj. Containing a group of light-colored silicate minerals that occur in igneous rocks. [FEL(DSPAR) + S(ILICA) + -IC.]
http://www.answers.com/topic/felsic
Very viscous lavas trapping in much dissolved gas. Like opening a carbonated beverage, when magma with lots of volatiles reaches the surface, the gases come out of solution and expand
http://answers.yahoo.com/question/index?qid=201303...
1 Additional Answer
Ask.com Answer for: felsic
fel·sic
[fel-sik]
ADJECTIVE [GEOLOGY]
1.
(of rocks) consisting chiefly of feldspars, feldspathoids, quartz, and other light-colored minerals.
Source: Dictionary.com
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