Gold chalcogenides
Introduction '''Gold chalcogenides''' are compounds formed between gold and one of the chalcogens, elements from group 16 of the periodic table: oxygen, sulfur, selenium, or tellurium. *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 reaction of hydrogen sulfide with gold(I) compounds. *Gold(III) sulfide, Au2S3, claimed material but unsubstantiated. *Gold tellurides: Au2Te3, Au3Te5, and AuTe2 (approximate formulæ) are known as non-stoichiometric compounds. They show metallic conductivity. Au3Te5 is a superconductor at 1.62 K.Gold telluride minerals, such as calaverite and krennerite (AuTe2), petzite (Ag3AuTe2), and sylvanite (AgAuTe2), are minor ores of gold (and tellurium). See telluride minerals for more information.
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