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It would depend on the limestone!

"Freestone" limestone (masons' term) is fairly soft, fine-grained and homogenous so can be cut into smooth faces and fine details but cannot be polished very highly. Typically, it is from Jurassic deposits: e.g. Portland Stone (S. England) and Caen Stone (NW France).

The original Mason-Dixon Line marker stones are of Portland Stone thanks to the Penn (as in ~sylvania) family's home links.

There is a bed found on Portland, called "Roach", which is hard, crystalline limestone riddled with the open moulds of small shells. These cavities give it a spnge-like texture, rendering it unsuitable for carving although is used in its own right for decorative work. In the past it was used for semi-ashlar civil- & military- engineering masonry.

Other limestones such as most of those from the Carboniferous, are very tough and crystalline, often shot through with calcite veins, so not amenable to fine stonework and sculptural uses.

In all limestone formations, some units can be thin and flaggy, useful as floor or walling stone, or as roofing "tiles", but little else.

Marble (in its geological sense) is metamorphosed from limestone, and is hard and finely-crystalline calcium carbonate. The higher the metamorphism heat and pressure the purer the mineral aas the original organic content has been driven out of the matrix. Loses its original bedding in the process. Can be cut in all directions and takes a high polish.

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12y ago

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