Homepage | Vlaams Instituut voor de Zee · 496 D. H. PORRENGA mineral formed both at shallower...
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Homepage | Vlaams Instituut voor de Zee · 496 D. H. PORRENGA mineral formed both at shallower depths (BORCHERT, 1964), and at greater depths than chamosite (R. E. Hunter, 1960, unpublished,