These items were the "mother's bones" which, when thrown by Pyrrha and Deucalion, turned into women and men.
Qi the Opener was born of one of these items that came into being when his father turned into a bear and frightened his mother. A magical one named Alatyr is guarded by Gagana and Garafena on the Booyan in Russian legends. In Irish mythology, one of these named Lia Fail roars for joy when it is in the presence of the rightful king. Sun Wukong, the Monkey King, was born from an egg of this substance, and Zeus resolved the dilemma of Laelaps and the Teumessian fox by turning each animal into one of these. These items were the "mother's bones" which, when thrown by Pyrrha and Deucalion, turned into women and men. Rhea tricked Cronus into swallowing one of these items instead of Zeus. For 10 points, name this substance that people turned into when they were gazed upon by Medusa.
Qi the Opener was born of one of these items that came into being when his father turned into a bear and frightened his mother.
stone [accept equivalents like rock]