They contribute to raise the professional and scientific profile of ICA.
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It consists of a weathering rind in which weathering has turned some of the feldspar into clay, resulting in a softer material, rated 3 to 4 on the Mohs scale of mineral hardness, which can be scratched.
Javier Cabrera Darquea, a Peruvian physician, received a small carved rock as a gift for his birthday.
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They disseminate knowledge both within the ICA community and to the wider world, and they drive some of the Council's key membership bodies.
These are recognised as modern curiosities or hoaxes.
From the 1960s Javier Cabrera Darquea collected and popularized the stones, obtaining many of them from a farmer named Basilio Uschuya.