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| CATEGORIES ABOUT PENNSYLVANIA BLUESTONE | |
| geologic formations | |
| geology of new york | |
| geology of pennsylvania | |
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The commercial refinishing process for bluestone cut slabs is called spalling. This process incorporates water and heat to reveal the natural layers of the stone as it was deposited originally. The cutting orientation must be almost exactly along the horizontal layers. The cut slab surface is soaked with water and heated rapidly with a wide nozzle propane torch, breaking off chips of stone along their natural fault lines. The spalled slabs are called Pennsylvania River Rock or variations of this name depending on the market or origin of the stone. If the initial deposit was made under slow moving water the ripples of the water action on the sand or mud will be revealed. This deposition process may be seen today at any ocean beach in shallow water or in a stream bed where conditions allow it to be observed. Spalling takes us back in the geological history of each slab to enjoy our earth's past. EXTERNAL LINKS
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