Amr bin Shu'ayb narrates from his father, and he from his grandfather (may Allah be pleased with him), that the Messenger of Allah (peace and blessings be upon him) said: "There is no zakah on stones."
All the narrators who transmit this hadith from Amr are da'if (weak).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7590