Oldhamite, Fluorite, Periclase, Thaumasite, Cuspidine, Portlandite, Spurrite

Locality: Dąbrowka Wielka, Siemianowice Śląskie, Katowice area, Upper Silesian Coal Basin, Upper Silesia (Śląskie), Poland

Inner part of a 1,7 cm fragment of the concretion-like sample with 2 types of mineral segregations. The green botryoidal one constits mainly of and oldhamite and fluorite with coexisting cuspidine, periclase and thaumasite (fluorite and cuspidine are more abundant in the outer part of the sample). The white zones are built up mainly with portlandite, periclase, spurrite and probably vaterite. The concretion appears to be formed by a few-step alteration (high temperature and hot gases activity, hydrolysis of the by-products) of the carbonate rock fragments, on an already recultivated, no more burning coal-dump.

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Photo added: 27th Jan 2007

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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