Look up tour de force in Wiktionary, the free dictionary. Tour de Force may refer to: 1  French phrase, meaning, a feat or display of strength, skill, or ingenuity, such as the funny movie is a comic tour de force.  Tour De Force (tour), 1986 Elton John Concert Tour.
Granite is an igneous rock composed of mostly two minerals: quartz and feldspar. It is an intrusive rock, meaning that it crystallized from magma that cooled far below the earth's surface.
Granite is a very hard rock. A geologist will tell you that it is an igneous or metamorphic rock that is highly saturated with silica. Silica when combined with oxygen makes the mineral quartz, and it has a hardness of 7 on the Mohs scale.