GRANITE

 

 

Type of Rock: Magma: Texture: Mineralogy:
Igneous rock Intrusive (doesn't reach the surface) cool at low temperatures. Phaneritic (coarse grained) Granite crystallizes from silicate minerals at relatively low temperatures and with relatively high percentage of silica is generally referred to as "felsic" rock. Predominant minerals : potasium feldspar and quartz.

THIN SECTION

A thin section is made by grinding down a slice of rock which has been glued to a glass slide until it reaches a thickness of about 0.03mm (30 microns). At this thickness most minerals become more or less transparent and can therefore be studied by a microscope using transmitted light.

 

Back to rocks of Famous Monuments

 

© Guillermo Rocha, P. G. / Brooklyn College Geology Department