a light rock wich lots of holes in it?
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A fine grained rock is formed as a result of faster cooling, which can occur near the surface of the earth. ... Natural processes of decay, weathering and erosion, cause these trapped minerals to decay faster than the surrounding rock, making 'holes' in them, which many times are semi-circular to circular.
Stones with a naturally occurring hole running all the way through them are known as hag stones and have long been regarded as lucky. Holes can be caused in nature by boring sponges, burrowing worms or molluscs, such as piddocks, or by water erosion following a weakness in the stone...
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