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Which types of rock are used for stone sculpture?
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Sculpture
Visitors viewing A Subtlety, or the Marvelous Sugar Baby, a sugar-coated polystyrene sculpture by Kara Walker, 2014, part of a temporary installation at the former Domino Sugar Refinery in Brooklyn, New York.
Stone has historically been the principal material for monumental sculpture due to its durability, global availability, and suitability for carving. Sculptors utilize rocks from all three main geological categories:1
- Igneous rocks: Formed by the cooling of molten mineral masses, these are among the hardest stones used. Examples include granite, diorite, basalt, and obsidian.
- Sedimentary rocks: Formed from accumulated mineral and organic deposits, these include sandstones, limestones, and alabaster.
- Metamorphic rocks: Created through extreme heat or pressure, the most prominent in sculpture is marble, which is recrystallized limestone. Famous varieties include Carrara, Pentelic, and Parian.
Additionally, hardstones—or semiprecious stones—are used for small-scale sculpture and gem carving. These include jade, rock crystal, rose quartz, amethyst, agate, and jasper. Soapstone (steatite), a soft mineral aggregate, has also been used for carvings since ancient times.2