Description Basalt in contact with phonolite from Greenland Harbour. Group of plagioclase epigenised into opal on the upper part, transformed into chalcedony on the lower. 1/20 crossed nicols. Polarised light.
Plaats: Kerguelen IslandAuthor Anoniem in Renard (1888)JPG file - 228.34 kB - 895 x 621 pixelsadded on 2012-07-16452 viewsFrom reference Renard, A. (1888). Report on the rock specimens collected... (page 142) This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License