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- Gold(III) oxide, Au2O3. Decomposes into gold and oxygen above 160 °C, and dissolves in concentrated alkalis to form solutions which probably contain the [Au(OH)4]− ion
- Gold(I) sulfide, Au2S. Formed by passing hydrogen sulfide through solutions of gold(I) compounds.
- Gold(III) sulfide, Au2S3, unstable in the presence of water.
- Gold tellurides: Au2Te3, Au3Te5, and AuTe2 (approximate formulæ) are known as non-stoichiometric compounds. They show metallic conductivity. One telluride of gold is a superconductor at very low temperatures: Au3Te5 (1.62 K).
Natural gold tellurides, like calaverite and krennerite (AuTe2), petzite ( Ag3AuTe2), and sylvanite (AgAuTe4), are minor ores of gold (and tellurium). See telluride minerals for more information on individual naturally occurring tellurides.
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