Geochemical data for Băile Lăzărești, Harghita, Romania in April 2025Geochemical evaluation of the soil in total organic carbon and heavy metals content, including Mn, Fe, Ti, V, Cr, Ni, Cu, Zn, As, Rb, Sr, Pb, Zr și Hg, for Băile Lăzărești, Harghita, Romania - April