Source: The Great Interpretation of Dreams (Ibn Sirin)
Eating stone in a dream indicates striving for a very difficult matter or disputing with a hard-hearted man.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Eating stone indicates gaining wealth with extreme difficulty.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Eating stone is interpreted as worry and fatigue.