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Description Dyke of felspathic basalt, Tristan da Cunha. Ground-mass composed of augite microliths in rosettes or planted perpendicularly on the plagioclastic lamellae, and crystals of olivine with vitreous inclusions.Plaats: Tristan da CunhaAuthor Anoniem in Renard (1888)JPG file - 450.94 kB - 799 x 847 pixelsadded on 2012-07-16647 viewsFrom reference Renard, A. (1888). Report on the rock specimens collected... (page 88) This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License