The Material Culture of the Cook Islands (Aitutaki)
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Stone was used a good deal in Aitutaki, but beyond their stone implements it was not worked. The genealogy of stone is given as follows:—
Pohatu maori is the dark stone of which there is a good outcrop at Black Rock, near Amuri. It was used for making stone implements. Unworked, it was used for a number of purposes.
Pohatu aoa seems to have been little used.
Pohatu aravai is a particular form of coral rock that was used for graters.