Science Fair Project Encyclopedia
Gold chalcogenides
Gold chalcogenides are gold compounds with anions from periodic table group 16, known as the chalcogens. Gold chalcogenides often appear as minerals. Gold chalcogenides have stability that is reversed from typical chalcogenides. For gold, the tellurides are the most stable, while the sulfide and oxide are metastable. For most other metals, it is the other way around.
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Gold tellurides
AuTe2 is present as a number of minerals, the most common being calaverite. Calaverite is the most important source of gold after native gold .
Gold selenides
AuSe exists in two forms, AuSe and Au2Se3.
Gold sulfides
Au2S is metastable, but mixed silver-gold sulfides like AgAuS do exist.
No studies of gold polonides have been conducted yet, as polonium is very rare in nature.
See also
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details