[{"from": "human", "value": "Could you provide a description of this molecule? [Mo]"}, {"from": "gpt", "value": "The molecule is a hard, high-melting (refractory) high-density dark gray metal or black powder. Insoluble in water. Used to make structural alloys; used as a catalyst. Molybdenum dust and fumes can irritate the eyes and respiratory tract."}]