[{"from": "human", "value": "What can you tell me about this molecule? [C-1][#Cr].[C-1][#Cr].[Cr+2]"}, {"from": "gpt", "value": "The molecule is a chemical compound of chromium that occurs rarely as the mineral tongbaite. It is used as a thermal spray material for protecting  underlying metal surfaces, as an additive to corrosion-resistant and wear-resistant materials, in coatings of bearings, seals, orifices, and valve seals, and as a fine-crystal phase in other sintered carbides, where it inhibits growth of submicrometre grains during pressing and sintering. Chromium is a chemical element which has the symbol Cr and atomic number 24. It is found naturally occuring in rocks, animals, plants, and soil, and is usually mined as chromite ore. Chromium is most toxic in its +6 oxidation state (chromium(VI)) due to its greater ability to enter cells and higher redox potential. Trivalent chromium (chromium(III)) however, is biologically necessary for sugar and lipid metabolism in humans. (L17, L516)"}]