Crab Orchard

By David Williams
Www.geologywriter.com
Photographs by: Sid Perkins

Named for Crab Orchard, Tennessee, which in turn is named for groves of crabapple trees, the rock first reached national prominence in the 1920s. Prior to that, it had mostly gone into flagging, sills, and foundations. According to a 1961 report by the U.S. Bureau of Mines, large scale quarrying started around 1926, when architect Henry Hibbs sought stone for Southwestern University in Memphis. Several quarries still produce the stone, which in 2001 went into and onto the Country Music Hall of Fame, in Nashville.

The Crab Orchard is a beautiful sandstone ranging in color from tan to blue gray with shades of yellow, pink, purple, and brown. Adding to the appeal, the colors appear as lines and swirls, many of which form geometric patterns. Dense and fine-grained, it is “relatively impervious to moisture, and comparatively inert to acid or fumes encountered in manufacturing areas,” or so wrote the Bureau folks in 1961. They also observed that dirt and soot could be readily washed off. What more could one want?

The Crab Orchard stone is remarkably homogeneous, containing on average about 93% silica. It occurs in beds of uniform thickness, which allowed quarrymen to produced a single sheet that measured 111 feet long, 8 1/2 feet wide, and 3 inches thick. More often, the slabs used in buildings are smaller, and appear as treads, copings, garden furniture, wainscoting, memorials, and roofing.

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