Abstract: Amphibolites in the miocene conglomerates of Medvednice Mt. containing mineral paragenesis hornblende + plagioclase ± epidote are typical of amphibolite facies of lower to middle part of medium grade metamorphism. According to chemical analyzes of minerals amphibole corresponds to hornblende and tschermakite and in the sample of the cataclastic amphibolites it is pargasite. Clinopyroxene is diopside. Plagioclas is altered in clay minerals, sericite and albite, excluding cataclastic amphibolites. Actinolite, tremolite and epidote occurring at the rims of hornblende together with albite and sericite in plagioclase point to retrograde metamorphism. Geothermobarometric calculations were made in the cataclastic amphibolite which contain primary plagioclase (oligoclas to andesine). Obtained temperature of 540 to 610 °C and pressure of 6 to 8 kb correspond to the established mineral paragenesis of the amphibolite facies of lower to middle part of medium grade metamorphism. Clinopyroxene is a relict mineral in amphibolites and indicates a magmatic protholite, what is in accordance with geochemical characteristic of these amphibolites for which earlier have been found that the protoliths were alkali and toleiite basalts originated in the ocean area. Age is determinated by 40Ar-39Ar method on the sample MD101 and responds to the middle Jurassic (176.7 ±1. 8 Ma). Petrological and geochemical characteristics of amphibolites from Miocene conglomerate of the Medvednica Mt. indicate that amphibolites are relicts of metamorphic sole of lercolites in Jurassic ophiolite complex of Bania.