Often pure sulphur (The Krysuvik
Red and brown colours:
Iron and sulphur (Fe, S), which
assimilates with the oxygen of the atmosphere.
The sulphur creates yellow colours and the iron red and brown
are created when sulphuric acids
dissolve the basaltic rock. H2S
assimilates the oxygen of the ground water and creates H2SO4 and clay
minerals are created.
are mainly created by Silica
(SiO2), Calcium (CaCO3), and sometimes also Gypsum (CaSO4, H2O).