From "granum" (Latin) grain
Rather a spotty rock! Granite is made of several different minerals, and you can see the individual grains of these (hence its derivation).
Granite is made up of different minerals, including
. It sometimes glitters because of the quartz and mica.
It is very hard. It can be used in building (the photograph is of some buildings in Edinburgh).
Larger pictures of Granite:
A polished specimen.