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As used in monuments, the same granite and marble may have a strikingly different appearance and coloration depending on whether their surface treatment has a flame finish, honed surface, or polished treatment. Marble is also highly vulnerable to damage from weathering and pollutants. Most marble, especially the colorful variety, is actually limestone, though commercial quarries and vendors, unlike geologists, tend to distinguish the two. It is often prized for its variegated color and veining, but may also be found in a pure white. Marble is created through a metamorphic process in which heat and pressure cause the recrystallization of sendimentary carbonate rocks, and is related to limestone. It can be soft and flinty and porous and, though easy to cut and tool, it is susceptible to weathering from the effects of acid rain and other pollutants. Limestone is a sedimentary rock comprised mainly of the mineral calcite and formed through the compression of mostly marine organisms in pre-historic times. Granite, an igneous rock, is formed through the cooling and crystallization of molten bodies within the earth. To a lesser degree, sandstone and its variants, brownstone and bluestone, have been used as building materials also for ornamental carvings and paving materials. There are three principal types of stone used in the structures, pedestals, and ornament of the many monuments that may be found throughout the parks system: granite, limestone, and marble.
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As such, monuments require materials with lasting properties. Monuments and memorials are society’s means of perpetuating memory in a physical format and establishing a forum for permanent commemoration. Click on images in the article for a larger view.