Material Fact Sheet: Granite
(c) COPYRIGHT 2010 NATURAL STONE COUNCIL rev. Sept 2018
This factsheet was developed by the Natural Stone Council as part of a continuous effort to provide reliable and useful information regarding Genuine Stone® products. The information presented has been extensively reviewed by owners and operators of granite quarries and fabrication facilities. To access factsheets for other stone types and learn more about Genuine Stone®, including the industry’s environmental initiatives, visit www.naturalstonecouncil.org
The United States is one of the chief producers of dimension stone in the world, having generated an estimated 2.73 million tons in 2017. Granite production typically is the largest or second largest portion of this market.
Despite its abundance in the U.S., granite is purchased from a number of other countries. Brazil, China, India, Italy, and Spain typically lead as sources of imports to the U.S. Exports of the material are shipped predominantly to Bamasas, Canada, Italy, and Mexico.
Sources: Dolley, T.P. 2017. 2015 Minerals Yearbook: Stone, Dimensional. U.S. Geological Survey. pg. 72.0-72.13.
Dolley, T.P. 2018. 2017 Mineral Commodity Summaries: Stone (Dimension). U.S. Geological Survey. pg. 156-157.
Stone World Magazine. Monthly Statistics. Accessed 07 August 2018. https://www.stoneworld.com/Stone-Import-Export-Stats/2018-April.
Products & Applications
PRODUCTS & APPLICATIONS:
Characteristics of quarried stone are dependent upon the attributes of the deposit from which the stone was extracted; each quarry is able to offer a range of products unique in dimensions, color, and structural properties to its deposit. Therefore, it is preferable that the designer and stone supplier collaborate closely prior to and throughout the design process since planning a project around readily available stone reduces the environmental impact of raw material extraction. Nevertheless, the most common dimensions of granite on the market are as follows:
- BLOCKS: Typical size of 8ft x 5ft x 5ft
- SLABS: Typical size of 8ft x 5ft with thickness of 2-3cm
Common Building Applications
- Aggregate, Curbing, Monuments, & Rip-Rap
FORMATION & SOURCES:
Granite is an igneous rock that forms when magma cools slowly beneath the earth’s surface, forming large, easily visible crystals of quartz, feldspar, and mica. Scientifically, an intrusive (plutonic) igneous rock must contain between 10% and 50% quartz to be classified as granite, but other similar stones such as gabbro, diabase, anorthosite, sodalite, gneiss, and basalt are sometimes sold as “granite” commercially.
The granite quarried in North America comes mainly from the eastern and upper Midwest United States, but quarries can be found from coast to coast.
INDOOR AIR QUALITY:
Volatile Organic Compounds (VOCs)
- None emitted directly from granite
- May source from adhesives and sealants applied; low-VOC options are available on the market
- Resources: refer to MSDS of chemical(s) used
A wide variety of granites exist on the market, both foreign and domestic, and these can be drastically different in density, hardness, porosity, and aesthetics. Users should verify that the granite they plan to use is applicable to the demands of the project and has a successful history in such installations. ASTM test data is the most common data available to compare the properties of any stone, including granite.
- Countertops: lifetime
- Flooring: 100 years with proper maintenance
- Exterior applications: lifetime
Source: National Association of Home Builders. 2007. Study of Life Expectancy of Home Components.
Reuse & Recyclability
- Ensure reclaimed granite meets ASTM specifications before using for structural purposes
- Example applications:
- Concrete mixture
- Retaining walls
- Re-installation on new buildings
ASTM C-615 “Standard Specification for Granite Dimension Stone”
- Includes material characteristics, physical requirements, and sampling appropriate
to the selection of granite for general building and structural purposes.
- The table below lists the required test values for granite; the necessary tests are
prescribed by and located in the ASTM standards.