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Natural Stone All limestones start as floors of shallow tropical seas. The famous stones of Portland and Bath were laid down 150million years ago when what is now that area of England was more like the Bahamas are today. The famous ooliths (tiny spheres) in limestones are grains of sand or pieces of shell around which calcium carbonate, which precipitated from the sea, has stuck. Some limestones, such as Portland, take their strength from their ooliths, with the additional benefit of being relatively easy to cut and carve. Other limestones, such as Bath stone, gain their strength not from the ooliths, but from the calcite cement in between the grains.
What is Cast Stone? Cast stone is a combination of crushed, oolitic limestone mixed with white cement. Like natural stone, it is formed by a wet sedimentation process. Cast stone is far stronger and doesn’t have the faults that natural stone has, providing more regularity and perfection in the finish. At 55 Mpa (mega pascals) our cast stone is well above the British required standard, making it extremely strong and durable. |
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Rudloe Stoneworks |