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Yule Marble is a marble of metamorphosed limestone found only in the Yule Creek Valley , in the West Elk Mountains of Colorado , 2.8 mi southeast of the town of Marble , Colorado .. marble. marble. metamorphosed. Metamorphic. limestone. limestone. Elk Mountains. Elk Mountains ( Colorado ). Colorado. Colorado. First discovered in 1873 , it is quarried today inside a mountain at 9,300 ft above sea level , in contrast to most marble , which is quarried from an open pit and at much lower elevations .. marble. marble. The localized geology created a marble that is 99.5 % pure calcite , with a grain structure that gives a smooth texture , a homogeneous look , and a luminous surface .. marble. marble. calcite. calcite. It is these qualities for which it was selected to clad the exterior of the Lincoln Memorial and a variety of buildings throughout the country , in spite of being more expensive than other marbles .. Lincoln Memorial. Lincoln Memorial. The size of the deposits enables large blocks to be quarried , which is why the marble for the Tomb of the Unknowns , with its 56 LT die block , was quarried from Yule Marble .. marble. marble. Tomb of the Unknowns. Tomb of the Unknowns. Yule 's quality comes at a high price due to the cost of quarrying in a high-altitude mountain environment .. This challenge has caused the industry and the town of Marble to undergo many boom-and-bust periods since quarrying started in the mid-1880s , making the town emblematic of the economic fluctuations that beset a single-industry economy .. boom-and-bust. boom and bust. Technology advancements in quarrying machinery and transportation have reduced , but not solved , the cost problem that afflicts the operation through the present .