Structure
Three forms are known: monoclinic acanthite, stable below 500 °C, body centered cubic so-called argentite, stable above 176 °C, and a high temperature face-centred cubic form stable above 586 °C. The higher temperature forms are electrical conductors. It is found in nature as relatively low temperature mineral acanthite. The name argentite refers to a cubic form, which, due to instability in "normal" temperatures, is found in form of the pseudomorphosis of acanthite after argentite. Acanthite is an important ore of silver. Ag2S is used as a photosensitizer in photography.
Read more about this topic: Silver Sulfide
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