Basalt is incredibly hard & sense.
I can't even imagine sculpting it into a sphere.
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Yeah definitely not an easy task, not quite as daunting as some of the Egyptian artefacts which are hard on the Mohs scale funny shaped and have extremely high tolerances for accuracy.
I feel as though much ancient knowledge for how to work with rock has been lost/hidden.
I'm struggling with the task of simply moving the rocks that have been dumped of my hill by previous owners.