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4 Answers
- 1 decade agoFavorite Answer
its made of granite
Source(s): http://en.wikipedia.org/wiki/Mount_Rushmore - 1 decade ago
Mount Rushmore is largely composed of granite. The memorial is carved on the northwest margin of the Harney Peak granite batholith in the Black Hills of South Dakota, so the geologic formations of the heart of the Black Hills region are also evident at Mount Rushmore. The batholith magma intruded into the pre-existing mica schist rocks during the Precambrian period about 1.6 billion years ago. However, the uneven cooling of the molten rock caused the formation of both fine and coarse-grained minerals, including quartz, feldspar, muscovite, and biotite. Fractures in the granite were sealed by pegmatite dikes.
- Anonymous1 decade ago
It is made of a rock type called the Harney peak granite. Mt. Rushmmore was also later intruded by a pegmatitic granite
- Anonymous1 decade ago
Cocain or marijana. Rushmore!
