Listvenit s výskytem minerálu gersdorffit-kobaltinové řady v lomu Dřínová u Tišnova (Morava)

Pavla Hršelová; Jiří Toman; David Buriánek; Dalibor Všianský

doi:10.5817/GVMS2024-38048

The occurrence of listvenite with gersdorffite-cobaltite solid solution in the Dřínová quarry near Tišnov (Moravia)

Vol.31,No.1-2(2024)

Pavla Hršelová Jiří Toman David Buriánek Dalibor Všianský

https://doi.org/10.5817/GVMS2024-38048

pdf (Czech)

Abstract

Chromian illite-magnesite-dolomite-quartz rock (listvenite-like) containing Ni-Co mineralization was found in the Svratka orthogneisses from the Dřínová quarry. The main rock-forming minerals are Fe-rich magnesite, Fe-rich dolomite, Cr-illite and quartz, less frequently calcite. Accessory minerals include chromite (with 0.841–0.886 apfu Fe²⁺ and 1.642–1.742 apfu Cr), gersdorffite-cobaltite (Ni_0.45-0.92Fe_0.01-0.34Co_0.01-0.34As_0.83-1.02Sb_0.00-0.03S₁), sulfides (pyrite, sphalerite), and apatite. The illite from the Dřínová quarry contains up to 3 wt. % of Cr₂O₃. Presence of the Cr-illite, accesory chromite, and Ni-Co sulfoarsenides represents origin from ultrabasic protolith, reflecting transformation to phyllosilicatecarbonate-
quartz listvenite.

Keywords:
gersdorffite; listvenite; cr-illite; carbonates; Dřínová

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