Historia naturalis bulgarica

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Date published: 29 December 2017

Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License

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Композиционни калцитови кристали от находище Сърнешко кладенче, Росенски руден район [Composite calcite crystals from the ‘Surneshko Kladenche’ deposit, Rossen ore district]

Минчева-Стефанова, Йорданка; Петрусенко, Светослав; Кръстева, Маргарита; Сокеров, Димитър [Minčeva-Stefanova, Jordanka; Petrussenko, Svetoslav; Krusteva, Margarita; Sokerov, Dimitar]

2017 — volume 24 — pp. 121—126 — [PDF]

Abstract: We studied calcite crystals from the ‘Surneshko Kladenche’ deposit of the Rossen ore district. They were formed in the cavities of calcite-chalcopyrite ore veins. The largest crystals reached 40 cm in length and 4—5 cm in thickness along the c-axis. They were observed in the upper parts of the veins. Their formation begins with crystallisation of the papierspaths with a lot of gas fluids. Later on, an oriented growth of platy monocalcite follows between the papierspath platelets, with a periphery of r {1011} faces. An oriented growth continues with numerous small, mainly rhombohedral, crystals on the free pinacoidal face and an overgrowth at the periphery of the {1011} face. The process ends with a peripheral scalenohedral growth of the platy crystals with the {3142}, {2131} and {2134} forms. The temperature of formation of 145—63 С suggests a genesis of calcite from low temperature hydrothermal solutions.

Keywords: calcite, crystal habit, crystallisation, inclusions, Rossen ore district