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In this paper we present the results from the mineralogical analyses performed on samples from three caves in the Băile Herculane area. All minerals are recorded for the first time in the investigated caves. This cavity, lays at the base of the first morphological level of the Malm-Neocomian limestone, developed in the mount of the Ciorici Peak, on the right slope of the Cerna Passage (under the Elisabeta Peak) which is lined with the Roman Hotel from the Băile Herculane balneal spa

After diffractometric X-ray analyses through the powder method, made on sampling tests from two caves in the Perşani Mountains karst, mineral associations made up of calcite, magnesium calcite, aragonite, dolomite, brushite, hydroxylapatite, carbonate-hydroxylapatite, gypsum and α-quartz were emphasized. Tables are presented with the resulting data from the diffractometric analyses, including the computed parameters of the elementary cells of each mineral species

By means of RX and IR analyses we emphasize an associations of minerals in Peştera Liliecilor (Liliecilor Cave) from the Olteţului Gorges made up by hydroxylapatite, carbonate-hydroxylapatite, ardealite, brushite and gypsum as the main minerals and quartz and illite as secondary minerals. In the final part of the paper, the authors present some opinions about the possible genesis of the mineral species

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