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It is contrasted with mafic rocks, which are relatively richer in magnesium and iron.Felsic refers to those rocks rich in silicate minerals, magma, and rocks which are enriched in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium.Scientists now have accurate methods (see below ) for dating fossils.methods rely on characteristic faunal and geological patterns to bracket the period when the fossil existed.I understand it's less common in men than women – presumably this is down to footwear choices?The cream product I use to cure it works very well, but its active ingredient appears to be urea.Choose: No Frames Layout Choose: Human Evolution Frames .

Often the species of mafic minerals is included in the name, for instance, hornblende-bearing granite, pyroxene tonalite or augite megacrystic monzonite, because the term "granite" already assumes content with feldspar and quartz.

They are usually light in color and have specific gravities less than 3. Common felsic minerals include quartz, muscovite, orthoclase, and the sodium-rich plagioclase feldspars. The term was used more broadly in older geologic literature.