Gravestones (a.k.a. headstones / tombstones) in modern American cemeteries are usually made of "granite" - a term in the retail trade for any hard stone that will take a fine polish. Geologically, some are granites and some are not. In the 1800s, many gravestones were made of marble, a crystalline-textured metamorphic rock composed of calcite (calcium carbonate, CaCO3). Rainwater is naturally acidic (slightly), with carbonic acid - H2CO3. Over time, marble will slowly dissolve in rainwater. Older marble gravestones typically have poorly legible carvings. The example seen here has a readable date of 1869.
Locality: Bishop Seybert Cemetery, Flat Rock, northern Ohio, USA
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