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Aquia Creek sandstone
Aquia Creek sandstone is a type of brown to light-gray freestone used extensively in building construction in Washington, D.C. in the late 18th and early 19th centuries. Quarried at Aquia Creek in Stafford County, Virginia, the stone was valuable for its ease of shaping and the quarry's proximity to the tidewater portion of the Potomac River, 45 miles south of Washington.
The sandstone was the principal material used in such significant buildings as the White House and the early stages of the U.S. Capitol. The easy availability of the stone and its ability to be carved were offset in time by its susceptibility to weather-induced deterioration. Its best, most enduring uses were as interior decorative elements.
==Geology==
Of Cretaceous age, Aquia Creek sandstone is composed of rounded, coarse- to fine-grains of quartz, cemented with silica and containing scattered pellets of clay as large as an inch in diameter. This sandstone is typically gray or tan, sometimes with streaks or shades of red, yellow or buff, giving the stone a warm effect.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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