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Description Tufa of Tristan da Cunha. Polysynthetic twinning of augite; reentrant angles at the upper part of the section by the alternation of the faces of two adjacent individuals.Plaats: Tristan da CunhaAuthor Anoniem in Renard (1888)JPG file - 177.65 kB - 594 x 674 pixelsadded on 2012-07-16689 viewsFrom reference Renard, A. (1888). Report on the rock specimens collected... (page 86) This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License