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Acanthite ps. after Argentite on Pyrite
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Previously labelled as Argentite, this well-crystallized silver sulphide specimen is now interpretted as Acanthite pseudomorphs after blocky Argentite crystals, as Argentite is not stable at lower temperatures, converting quickly to Acanthite which maintains its crystal shape. This extremely rich silver-ore specimen is very much characteristic or the mines at Medenec (Kupferberg) in the Krušné Hory Mts, Bohemia, Czechia although specimens are now so rarely seen available. The dark grey metallic Acanthite crystals are really well-formed and in great condition, on a layer of fine-grained Pyrite. They reach up to 9 mm across in size. Ex Hans Engelbrecht Collection, no. 4188, acquired by him in 1983.
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| Date | Collector | Acquisition price |
|---|---|---|
| — | Crystal Classics | Not disclosed |
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Mineral guide
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, stable low-temperature Ag2S; black masses with cubic crystals argentite pseudomorphs on calcite; prized for form and notable localities.Regional guide
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