Microporous gold: Comparison of textures from Nature and experiments

Victor Okrugin, Elena Andreeva, Barbara Etschmann, Allan Pring, Kan Li, Jing Zhao, Grant Griffiths, Gregory Lumpkin, Gerry Triani, Joel Brugger

    Research output: Contribution to journalArticle

    14 Citations (Scopus)

    Abstract

    Recent experiments have shown that microporous gold can be obtained via the oxidative dealloying of Au(Ag)-tellurides such as calaverite (AuTe 2), krennerite (Au3AgTe8), and sylvanite [(Au,Ag)2Te4] under mild hydrothermal conditions. The same Au textures have been found in natural gold-telluride ores from the Late Miocene epithermal Aginskoe Au-Ag-Te deposit in Kamchatka, Russia. This confirms that natural microporous gold can form via the replacement of telluride minerals. This replacement may take place under hydrothermal conditions, e.g., during the late stage of the ore-depositing event, explaining the wide distribution of "mustard gold" in some deposits. At Aginskoe, the oxidation of Au-tellurides appears to have resulted only in local redistribution of Au and Te, because the associated oxidation of chalcopyrite scavenged the excess Te, inhibiting the crystallization of secondary Te minerals more than a few micrometers in size. Such cryptic mobility may explain the lack of reported secondary Te minerals in many Te-bearing deposits.

    Original languageEnglish
    Pages (from-to)1171-1174
    Number of pages4
    JournalAmerican Mineralogist
    Volume99
    Issue number5-6
    DOIs
    Publication statusPublished - 2014

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  • Cite this

    Okrugin, V., Andreeva, E., Etschmann, B., Pring, A., Li, K., Zhao, J., Griffiths, G., Lumpkin, G., Triani, G., & Brugger, J. (2014). Microporous gold: Comparison of textures from Nature and experiments. American Mineralogist, 99(5-6), 1171-1174. https://doi.org/10.2138/am.2014.4792