Renard (1888, fig. 16)
Beschrijving: 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 Cunha
Auteur: Anoniem in Renard (1888)
Uit bron: Renard, A. (1888). Report on the rock specimens collected... (pagina 86)
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