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Fluorite
The lower portion of this specimen consists of corroded yellowish fluorite, the upper part of purple fluorite, the summit of which is complete and topped by small calcite crystals. The lower portion is naturally corroded. A possible explanation is that the lower part was formed by simultaneous crystallization of fluorite and barite and that competition between the two impeded the development of well defined crystals, while the upper part was formed from crystallization of fluorite alone and that occurred later (hence the difference in color). A later influx of fluid corroded and completely dissolved the barite on the lower part without attacking the fluorite, hence the ensemble's mushroom-like appearance.
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