empressite
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Empressite or tellursilberblende is a mineral form of silver telluride, AgTe. It is a rare, grey, orthorhombic mineral with which can form compact masses, rarely as bipyramidal crystals.
Wikidata facts
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- Empressite-583052.jpg
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- chemical formula
- AgTe
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 2.CB.80
- Nickel-Strunz 9th edition (updated 2009)
- 2.CB.80
- Commons category
- Empressite
- IMA Mineral Symbol
- Eps
- Strunz 8th edition (series ID, updated)
- II/A.03 – Anhang
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Empressite or tellursilberblende is a mineral form of silver telluride, AgTe. It is a rare, grey, orthorhombic mineral with which can form compact masses, rarely as bipyramidal crystals.
Recent crystallographic analysis has confirmed that empressite is a distinct mineral with orthorhombic crystal structure, different from the hexagonal Ag5−xTe3 with which empressite has been commonly confused in mineralogy literature. At the same time, empressite does not appear on the equilibrium Ag-Te phase diagram, and therefore it is only metastable at ambient conditions. Given infinite time, it would phase separate into pure Ag5Te3 and pure Te.