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Description Basalt of Red Hill. Section of plagioclase perpendicular to the edge P/M, with the traces of two cleavages parallel P and M; on the right, remains a part of an individual twinned following the albite law. 1/20 crossed nicols.Plaats: Ascension IslandAuthor Anoniem in Renard (1888)JPG file - 214.70 kB - 555 x 669 pixelsadded on 2012-07-16636 viewsFrom reference Renard, A. (1888). Report on the rock specimens collected... (page 64) This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License