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Stone description: fine grain
| Wall Number | Country | State | Classification | Source Sort ascending |
|---|---|---|---|---|
| 14LA14 | United States | Iowa | Dolomite | Mt. Vernon |
| 6RB40 | United States | Maryland | Gneiss | Mt. Royal |
| 9LB16 | United States | Maryland | Limestone | Mt. Pleasant |
| 6LB28 | United States | New York | Sandstone | Mt. Pleasant |
| 13LB20 | United States | Iowa | Limestone | Mt. Pleasant |
| 9RB9 | United States | Iowa | Limestone | Mt. Pleasant |
| 14LA20 | United States | Iowa | Limestone | Mt. Pleasant |
| 5LA1 | United States | Ohio | Sandstone | Mt. Gilead |
| 5LA19 | United States | Ohio | Sandstone | Mt. Gilead |
| 8RA26 | United States | North Carolina | Sandstone | Morrisville |
| 12RB31 | United States | Pennsylvania | Marble | Morristown |
| 9RA3 | United States | Colorado | Limestone | Morrison |
| 6LA23 | United States | North Carolina | Gneiss | Morganton Depot. |
| 6LB38 | Mexico | Tuff | Morelos State | |
| 14LB35 | Spain | Limestone | Morata, Saragossa | |
| 6LB23 | United States | North Carolina | Gneiss | Mooresville |
| 5RB23 | United States | North Carolina | Granite | Mooresville |
| 5RB39 | United States | Maryland | Granite | Montrose |
| 13RA26 | Canada | Limestone | Montreal region | |
| 14LB1 | United States | Indiana | Dolomite | Montpelier |
| 14LB17 | United States | Iowa | Dolomite | Monticello |
| 10LB22 | United States | Massachusetts | Gneiss | Monson |
| 6LA39 | United States | Massachusetts | Gneiss | Monson |
| 9RA21 | United States | Ohio | Sandstone | Monclava |
| 5RB32 | United States | Colorado | Diorite | Monarch |
| 14RA29 | Austria | Limestone | Mokritz | |
| 9LA16 | United States | Minnesota | Limestone | Minneapolis |
| 14RB8 | United States | Minnesota | Limestone | Minneapolis |
| 12RA6 | United States | Wisconsin | Dolomite | Milwaukee |
| 13RA4 | United States | Wisconsin | Dolomite | Milwaukee |
| 11RA10 | United States | Ohio | Dolomite | Milton Twp. Woods Co. |
| 8RA32 | United States | Texas | Sandstone | Milsap |
| 7RB30 | United States | Texas | Sandstone | Milsap |
| 6RA35 | United States | Connecticut | Granite | Millstone Point |
| 1L3 | United States | Connecticut | Granite | Millstone Point |
| 5LA7 | United States | Ohio | Sandstone | Millersburg |
| 12RB33 | United States | Ohio | Limestone | Millersburg |
| 14RA10 | United States | Pennsylvania | Dolomite | Mill Lane Chester Co. |
| 6RA44 | United States | New Hampshire | Granite | Milford |
| 10RA40 | United States | New Hampshire | Granite | Milford |
| 7RB40 | United States | New Hampshire | Granite | Milford |
| 1L1 | United States | Connecticut | Gneiss | Milford |
| 5LA34 | United States | Connecticut | Gneiss | Middletown |
| 13RA22 | United States | Missouri | Sandstone | Miami Station Carroll Co. |
| 10LA38 | Mexico | Dacite | Mexico State | |
| 6La7 | United States | Pennsylvania | Sandstone | Meshoppen |
| 10RB29 | United States | New York | Sandstone | Medina |
| 6RQ | United States | Ohio | Sandstone | McDermont |
| 8RQ | United States | Ohio | Sandstone | McDermont |
| 10Lb46 | United States | Wisconsin | Sandstone | Mauston |
| 10Lb47 | United States | Wisconsin | Sandstone | Mauston |
| 6RA5 | United States | Pennsylvania | Sandstone | Mauch Chunk |
| 13LB13 | United States | Iowa | Limestone | Mason City |
| 14RA23 | United States | Iowa | Limestone | Mason City |
| 10RA37 | United States | New Hampshire | Granite | Mason |
| 4RB20 | United States | New Hampshire | Granite | Mason |
| 11RB10 | United States | Kansas | Dolomite | Marysville |
| 9LA45 | Canada | Sandstone | Mary's Point, New Brunswick | |
| 6RA42 | United States | New Jersey | Sandstone | Martinville |
| 11RB12 | United States | Missouri | Dolomite | Marshfield |
| 12LA15 | United States | Iowa | Dolomite | Marshalltown |
| 12RA21 | United States | Iowa | Limestone | Marshalltown |
| 7RA42 | United States | Michigan | Sandstone | Marquette |
| 5RB44 | United States | New Hampshire | Granite | Marlborough |
| 11RB9 | United States | Kansas | Dolomite | Marion Center |
| 10La9 | United States | Kansas | Dolomite | Marion Center |
| 7RB27 | United States | Kentucky | Sandstone | Marion |
| 5RA13 | United States | Ohio | Sandstone | Marietta |
| 5RA5 | United States | Ohio | Sandstone | Marietta |
| 13LA36 | Hungary | Limestone | Margarethen Leitha Mts. | |
| 14LA37 | Hungary | Limestone | Margarethen Leitha Mts. | |
| 14LA21 | United States | Iowa | Limestone | Marble Rock |
| 10LB13 | United States | Iowa | Limestone | Marble Rock |
| 9RA4 | United States | Colorado | Marble | Marble |
| 9LA3 | United States | Colorado | Marble | Marble |
| 7La18 | United States | Pennsylvania | Quartzite | Mapleton |
| 14LA42 | Portugal | Marble | Manoel Zuarte, Leiria | |
| 9C | United States | Minnesota | Limestone | Mankato |
| 13RA7 | United States | Minnesota | Dolomite | Mankato |
| 17C | United States | Minnesota | Limestone | Mankato |
| 1C | United States | Minnesota | Limestone | Mankato |
| 12RB6 | United States | Wisconsin | Dolomite | Manitowoc |
| 9LA13 | United States | Kansas | Limestone | Manhattan |
| 8LB35 | United States | Connecticut | Sandstone | Manchester |
| 11LB37 | United States | Virginia | Granite | Manchester |
| 14LB15 | United States | Iowa | Dolomite | Manchester |
| 11RB29 | United States | Virginia | Sandstone | Manassas |
| 10RA3 | United States | Vermont | Marble | Mallett's Bay |
| 10RB9 | United States | Vermont | Marble | Mallett's Bay |
| 10LA3 | United States | Vermont | Marble | Mallett's Bay |
| 10RA4 | United States | Vermont | Marble | Mallett's Bay |
| 10RA5 | United States | Vermont | Marble | Mallett's Bay |
| 10LA4 | United States | Vermont | Marble | Mallett's Bay |
| 2L15 | United States | Vermont | Marble | Mallett's Bay |
| 2R15 | United States | Vermont | Marble | Mallett's Bay |
| 14LB3 | United States | Vermont | Marble | Mallett's Bay |
| 6RA1 | United States | Pennsylvania | Sandstone | Mainesburgh |
| 8RB16 | United States | Wisconsin | Limestone | Madison |
| 10R51 | United States | Pennsylvania | Argillite (Slate) | Lynnport |
| 10L51 | United States | Pennsylvania | Argillite (Slate) | Lynnport |