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acid precipitation acid rain air pollution algae or fungi AMERICAN STATES BUILDING ation crusts Black alteration crusts black crust blackened alteration Botanic Gardens building building show Building—Site buildings and monuments built calcite matrix calcium carbonate Capitol Gatehouse carved details cleaned color column capitals composed of calcium Constitution Avenue Continue south Corcoran Gallery crystals dedicated in 1922 dissolves edges effects of acid Federal Triangle feldspar forms fossil fragments Grant Memorial gypsum impact of acid Jefferson Memorial limestone and marble limestone buildings Lincoln Memorial marble and limestone marble baluster marble balustrade marble bases Memorial Continental Hall Memorial—Site mica mineral composed Nation's capital northeast Northeastern United Organization of American Peace Monument Pennsylvania Avenue primarily composed pyrite Renwick Gallery roof overhang sandstone sheltered areas Silicate mineral inclusions southeast corner stone buildings stone deterioration stone surface stone types sulfuric surrounding calcite tour tures U.S. Geological Survey volute walk north washing Washington Monument White House