[{"from": "human", "value": "Provide a description of this molecule. [S][=Zn]"}, {"from": "gpt", "value": "The molecule is a sulfide of zinc. It occurs naturally as the mineral sphalerite. Zinc sulfide is a semiconductor and is used as an infrared optical material and as phosphor in applications such as cathode ray tubes and glow in the dark products. Zinc is a metallic element with the atomic number 30. It is found in nature most often as the mineral sphalerite. Though excess zinc in harmful, in smaller amounts it is an essential element for life, as it is a cofactor for over 300 enzymes and is found in just as many transcription factors. (L48, L49, L80)"}]