Abstract: “Çan stone” is composed of rhyolitic tuffs, which are the pyroclastic products of the Oligocene volcanicsof the Biga Peninsula, which have widespread outcrops around Çan-Etili. In this study, the petrographic andmineralogical (XRD-SEM / EDX) evaluations of Çan stone tuffs are carried out. Furthermore, geochronologicaldating is performed to determine the chronostratigraphic position in the widespread volcanism of the area. The Çanstone tuff, which is determined to be of late Oligocene age, shows light yellowish, creamy and reddish -brownishdifferent motifs developed by ferrious oxidation after hydrothermal alteration. According to the results of the XRDand SEM / EDX analyzes of Çan stones; quartz, sanidine, albite, pyrite, kaolinite, alunite and rarely biotite andamphibole minerals are detected. The pyrite minerals, which are rarely euhedral and mostly composed of crystalspacked in frambolites, form different patterns on these tuffs. Owing to these motifs, Çan stones have been interestedand used for covering stone and / or for decorative purposes in the construction sector for many years.