Noun
large mass of intrusive igneous rock believed to have solidified deep within the earth
Source: WordNetQuartz grains evolve from plutonic rock, which are felsic in origin and also from older sandstones that have been recycled. Source: Internet
Surface expression and erosion A batholith is an exposed area of (mostly) continuous plutonic rock that covers an area larger than 100 square kilometers (40 square miles). Source: Internet