Telluride mineral
(repeating unit)Ag5−xTe3 (with x = 0.24 to 0.36) | | IMA symbol | Stz[1] |
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| Strunz classification | 2.BA.30e |
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| Crystal system | Hexagonal |
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| Crystal class | Dihexagonal dipyramidal (6/mmm)
H-M symbol: (6/m 2/m 2/m) |
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| Space group | P6/mmm |
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| Unit cell | a = 13.38, c = 8.45 [Å]; Z = 7 |
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| Identification |
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| Color | Dark lead-gray |
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| Crystal habit | Massive, compact, granular |
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| Cleavage | None observed |
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| Fracture | Subconchoidal |
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| Tenacity | Brittle |
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| Mohs scale hardness | 3.5 |
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| Luster | Metallic |
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| Diaphaneity | Opaque |
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| Specific gravity | 8.0 |
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| Alters to | Tarnishes rapidly to a dark bronze to iridescence |
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| Other characteristics | Anisotrpism in polished section: Moderate, in gray reddish brown-blue |
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| References | [2][3][4] |
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Stützite or stuetzite is a silver telluride mineral with formula: Ag5−xTe3 (with x = 0.24 to 0.36)[2] or Ag7Te4.[5]
It was first described in 1951 from a museum specimen from Sacarimb, Romania. It was named for Austrian mineralogist Andreas Xaverius Stütz (1747–1806).[2][3]
It occurs with other sulfide and telluride minerals in hydrothermal ore occurrences. Associated minerals include sylvanite, hessite, altaite, petzite, empressite, native tellurium, native gold, galena, sphalerite, colusite, tennantite and pyrite.[2]
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ a b c d Handbook of Mineralogy
- ^ a b Mindat.org
- ^ Webmineral data
- ^ Mineral Atlas
