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A sulfide is an anion of sulfur (S2-). Examples of sulfides include ammonium sulfide, disulfide, hydrogen sulfide, and nitrogen sulfide.

Upon the discovery of what was later determined to be the sentient inorganic microbrain, Doctor Crusher ran a spectral analysis in order to determine the composition of the being. Upon completion of the analysis, it was determined to be made up of silicon and germanium, making it a transistor material; gallium arsenide, meaning that it emitted light when charged; cadmium selenide and sulfide, meaning that it emitted charge when lit; and water, impurities, sodium salts, meaning that it was a conductor. From those results, the computer was able to positive determination that it was indeed life. (TNG: "Home Soil")

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