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Presented specimen is a dense and grainy aggregate of marcasite, on which surface grown the crystals of calcite.

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Marcasite is a common mineral, which is finding mainly in sedimentary rocks, in veins of ore, marls and clays. It belongs to the class of sulphides. It has a brass-yellow color with a greenish tinge and a metallic sheen. Marcasite forms crystals, bunchy aggregates, or clusters. Calcite is a rock-creating mineral from group of carbonates. It occur in many different forms, one of its feature is creation of crystals in the isomeric, tabular, pistil or needle forms. Presented specimen is a dense and grainy aggregate of marcasite, on which surface grown the crystals of calcite.

Elaborated by the editorial team of Małopolska's Virtual Museums,
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This work is licensed under a Creative Commons Attribution 3.0 Poland License.

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Zinc and lead minerals

Sandstone with mudstone intercalations and marl with marly limestone deposited first in  shallow then in a deeper basin in the Triassic. A carbonate complex, build mainly of limestone and partly of dolomite developed in the Middle Triassic. 

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Sandstone with mudstone intercalations and marl with marly limestone deposited first in  shallow then in a deeper basin in the Triassic. A carbonate complex, build mainly of limestone and partly of dolomite developed in the Middle Triassic. There are high amounts of zinc and lead ores in dolomites (Olkusz, Trzebionka).
Polish deposits of zinc and lead ores exploited in the past and nowadays are connected with Silesian-Kraków Triassic dolomites (ore-bearing dolomite). Mining exploitation was carried out in the area of: Bytom, Tarnowskie Góry, Olkusz, Jaworzno and Chrzanów. In the 2nd half of the 20th century the mines: Trzebionka (1962), Olkusz (1968) and Pomorzany (1974) were opened. The mines Pomorzany and Olkusz were merged into one enterprise Olkusz-Pomorzany in 1976. Trzebionka mine is successively liquidated, the final close out is planned in 2009, so it can be worth to collect available specimen of galena, sphalerite, marcasite, barite, gypsum and cerusite  from that locality. Polished cross-sections through  collomorphic aggregates of sphalerite including galena crystals and marcasite are really valuable for collectors. The name schallenblende” was characteristic for the terminology concenring deposits from Upper Silesia and it is used in scientific terminology and among collectors. The scientific investigations which have been carried on for a long time allow to confirm that Upper Silesian occurrences of zinc and lead ores correspond to the Alpine ones, spreading from France through Italy (Salafossa, Raibl) and Austria (Bleiberg) up to Slovenia (Mezica). They are of the same age and occur in the same geological formations. They also correspond to American deposits (Mississipi Valley Type) which was confirmed at the Geological Congress in London in 1952.

Elaborated by the Geological Museum at the Faculty of Geology, Geophysics and Environmental Protection of the AGH University of Science and Technology, © all rights reserved

See also:
Marcasite from “Pomorzany” Coalmine
Sphalerite from “Pomorzany” Coalmine
Sphalerite
Sphalerite— Galena
Calcite with marcasite

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Calcite with marcasite

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