Trepel – A Peculiar Sedimentary Rock of Biogenetic Origin from the Suvodol Village, Bitola, R. Macedonia

Abstract

In the paper are shown results of the mineralogical-petrographical examinations of the trepel as apeculiar sedimentary rock of biogenetic origin from the Suvodol village near Bitola city, Republic of Macedonia. Accordingto the microscopic (in polarizing translucent light), SEM, chemical, X-ray powder data was determined thatexamined trepel is composed mainly of opal (of biogenetic origin) as well as quartz, feldspars (plagioclases, Kfeldspars),illite – hydromicas, chlorites of minor importance. Further examinations are in progress because theaforementioned results are based on one randomly selected trepel sample.