TY - JOUR A1 - Scharm,B. A1 - Scharmova,M. T1 - Accessory minerals of siliceous rocks from the Koksin hill near Mitov (Barrandian Neoproterozoic) JF - Bulletin of Geosciences JA - Bull. Geosci. Y1 - 2000 VL - 75 IS - 3 SP - 307 EP - 318 CY - Prague PB - Czech Geological Survey SN - 1803-1943 (online), 1802-6222 (print) AV - Free KW - Upper Proterozoic KW - Barrandian KW - chert KW - chromsilexite KW - stromatolite KW - sulvanite KW - tyrrellite KW - eskebornite KW - athabascaite KW - chromphyllite KW - florencite-(Nd) KW - florencite-(La) KW - monazite-(Nd) KW - monazite-(La) KW - plumbogummite KW - gorceixite KW - crandallite KW - ferro-actinolite AB - SEM-EDX examination of siliceous stromatolites and chromsilexites from the Koka.n locality revealed an exceptional assemblage of accessory minerals that are the main carriers of minor and trace elements as V, Cr, REEs, Ba, Pb, Sr, Se, Ti, Cu, Ag, Co, and P. Some of the minerals belong to rare species at all (e. g. sulvanite, tyrrellite, eskebornite, athabascaite, chromphyllite, florencite-(Nd), florencite-(La), monazite-(Nd), monazite-(La), plumbogummite). Beside the accessories, ferro-actinolite having the composition close to the ideal Fe2+-end member of the tremolite- ferro-actinolite series has also been found in quartz-veinlets traversing the chromsilexites. ER -