2516            |    Granite, porphyry, basalt, sandstone and other monumental or building stone, whether or not roughly trimmed or merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape.
2516.11.00     -- Crude or roughly trimmed
2516.12.00     -- Merely cut, by sawing or otherwise, into blocks or slabs of a rectangular (including square) shape
2516.20.00   - Sandstone
2516.90.00   - Other monumental or building stone