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Description Trachyte of Red Hill. Large section of sanidine in a vitreous ground-mass is surrounded by small lamellar crystals superimposed and twinned, embedded in the base. The cracks traversing the large section are almost perpendicular to M. 1/40 crossed nicols.Plaats: Ascension IslandAuthor Anoniem in Renard (1888)JPG file - 636.22 kB - 1 580 x 778 pixelsadded on 2012-07-16501 viewsFrom reference Renard, A. (1888). Report on the rock specimens collected... (page 52) This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License