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Trade Classification of Stone Types - 3. Sandstone

Updated:2007-11-19 11:09:32

3. Sandstone

Fine to medium grained sedimentary rock having a minimum of 60% free silica. Colors range from light grey to yellow and brown. Common commercial varieties are: 

Bluestone. A dense, hard, fine grained commonly feldspathic sandstone of medium to dark greenish grey or bluish-grey color that may split readily along original bedding planes to form thin slabs.

Brownstone. A dense, medium-grained sedimentary stone, with a distinctive dark brown to red brown color.

3.3.1 Quartzitic Sandstone which contains at least 90% free silica.

3.3.2 Quartzite - Highly indurated, typically metamorphosed sandstone containing at least 95% free silica.

Sandstone supplied under ASTM C-616 Standard Specification for Quartz-based Dimension Stone shall conform to the physical requirements indicated in the following table:


source: www.buildingstoneinstitute.org

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