Leave those babies sphere shaped and you've got the Moeraki boulders,
geological curiosities from New Zealand. <see picture attached>

<encyclopedia thievery starts here>
Neither igneous nor sedimentary, they consist mainly of carbonate of lime,
silica, alumina and peroxide of iron. Formed around a central core of lime
crystals which appear to have the power of attracting and consolidating the
above ingredients from the adjacent soil. The shape of the boulders is not
due to the action of the sea.

--

Ian

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