[{"from": "human", "value": "Could you give me a brief overview of this molecule? [O][Branch1][C][Hg][Hg]"}, {"from": "gpt", "value": "The molecule appears as black or brownish-black powder. Not a true compound but rather an intimate mixture of metallic mercury and mercuric oxide. Insoluble in water and denser than water (density 9.8 g / cm3). Hence sinks in water."}]