Uber die vulkanischen Gesteine in Sicilien und Island und ihre Submarine Umbildung

In 1853, Darwin's German contemporary, Wolfgang Sartorius von Waltershausen (1809-76) published this study of palagonite, a mineral commonly occurring in rocks produced by submarine eruptions. Analysing palagonite and other minerals, he proposes a detailed model of metamorphic processes, taking into account factors including pressure, temperature and presence of water.