( ( ( ( ( ( ( Classification ( of ( ( Igneous Rocks ) ( ( ( A ( simple classification ) ) ( of ( igneous rocks ) ) ) ( can ( be ( accomplished ( by ( examining ( ( grain size ) ( of ( the ( mineral crystals ) ) ) ) ) ) ) ) ) ) ) ) ) , ) ( temperature ( ( at which ) ( solidification occurs ) ) ) ) , ) and ) ( ( the quantity ) ( of ( ( ( mafic and ) felsic ) minerals ) ) ) ) ( ( found ( in ( the rock ) ) ) . ) )
(ROOT (S (NP (NP (NP (NN Classification)) (PP (IN of) (NP (NP (NNP Igneous) (NNP Rocks)) (SBAR (S (NP (NP (DT A) (JJ simple) (NN classification)) (PP (IN of) (NP (JJ igneous) (NNS rocks)))) (VP (MD can) (VP (VB be) (VP (VBN accomplished) (PP (IN by) (S (VP (VBG examining) (NP (NP (NN grain) (NN size)) (PP (IN of) (NP (DT the) (NN mineral) (NNS crystals))))))))))))))) (, ,) (NP (NP (NN temperature)) (SBAR (WHPP (IN at) (WHNP (WDT which))) (S (NP (NN solidification)) (VP (VBZ occurs))))) (, ,) (CC and) (NP (NP (DT the) (NN quantity)) (PP (IN of) (NP (ADJP (JJ mafic) (CC and) (JJ felsic)) (NNS minerals))))) (VP (VBD found) (PP (IN in) (NP (DT the) (NN rock)))) (. .)))
Classification of Igneous Rocks A simple classification of igneous rocks can be accomplished by examining grain size of the mineral crystals, temperature at which solidification occurs, and the quantity of mafic and felsic minerals found in the rock.
(ROOT (S (NP (JJ Felsic) (NNS igneous) (NNS rocks)) (VP (VP (VBP contain) (NP (JJ felsic) (NNS minerals))) (, ,) (VP (ADVP (RB typically)) (VBP contain) (NP (NN aluminum) (CC and) (NN sodium))) (CC and) (VP (VBP are) (ADJP (JJ high) (PP (IN in) (NP (NN silica)))))) (. .)))
Felsic igneous rocks contain felsic minerals, typically contain aluminum and sodium and are high in silica.