Dolomite on Calcite

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Interesting specimen showing a cluster of crystallized calcite, this now in the process of being replaced by crystallized dolomite. Note that the interior of this cluster is starting to hollow out and there are remnant crystals present within. These are actually present but loose, still tightly fit so they will not come out of the hole. This is shown in the video. Very interesting replacement specimen.The Boldut Mine, located within the Cavnic mining district of Maramures County, Romania, is part of a historic mining region with roots dating back to medieval times and earlier, while intensive industrial extraction of its polymetallic ores operated heavily through the 20th century until final closure around 2005. Geologically, the deposit sits within the Neogene volcanic belt of the Inner Carpathians, where hydrothermal activity driven by calc-alkaline magmatism emplaced rich veins of lead, zinc, copper, gold, and silver into volcanic and sedimentary host rocks. The underground workings became internationally renowned among mineral collectors for producing diverse sulfide and carbonate assemblages, including quartz, dolomite, rhodochrosite, calcite, sphalerite, and galena.