File:Schalenblende (zinc-lead ore) (Early Cretaceous mineralization, ~135 Ma; Pomorzany Mine, Upper Silesia, Poland) 4 (39340548870).jpg

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Schalenblende from the Cretaceous of Poland. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)

Silvery-black = galena Grayish-brassy gold = pyrite/marcasite Dark brown = sphalerite Yellowish = wurtzite

“Schalenblende” (“shell ore”) is quite striking for its brassy and silvery metallic colors mixed with brown and yellow. Schalenblende is a zinc-lead ore consisting of botryoidal crusts of brownish-colored sphalerite (zinc sulfide - (Zn,Fe)S), yellowish-colored wurtzite (zinc sulfide - (Zn,Fe)S), brassy-colored pyrite/marcasite (iron sulfide - FeS2), and silver-colored galena (lead sulfide - PbS). Because of the high galena content, schalenblende samples are remarkably heavy for their size.

Origin: published research on schalenblende material indicates that mineralization was from a sulfide gel or colloidal dispersion. Crystallization took place during the early Early Cretaceous, at about 135 million years (= Valanginian Stage or Hauterivian Stage, depending on which geologic time scale one uses). This schalenblende occurrence is hosted in epigenetic dolosparites of the upper Lower Muschelkalk Formation (Middle Triassic).

Locality: Pomorzany Mine, Olkúsz, Bytom (Beuthen) District, ~40 km northwest of Krakow (Krakau / Cracow), Upper Silesia, southern Poland (~50° 18’ North latitude, ~19° 33’ East longitude)
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Source Schalenblende (zinc-lead ore) (Early Cretaceous mineralization, ~135 Ma; Pomorzany Mine, Upper Silesia, Poland) 4
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/39340548870 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

1 December 2019

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current09:04, 1 December 2019Thumbnail for version as of 09:04, 1 December 20193,593 × 1,950 (4.76 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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