Ge'odes

Ge'odes (Gr., 'earthy') are rounded hollow concretions, or indurated nodules, either empty or containing a more or less solid and free nucleus, and having the cavity frequently lined with crystals. They are sometimes called 'potato stones,' on account of their size and shape. They were the aëtites ('eagle-stones') of the Greeks, who asserted they were found only in eagles' nests. The eagles could not breed without their aid, and the aëtites were supposed to be beneficial to women in labour.