Abstract
Computer-based Mössbauer spectroscopic and X-ray diffraction procedures have been used to study the yellow/brown surface deposits, occurring on andesite boulders and rock fragments near gently steaming areas, fumarole vents, boiling pools and streams on White Island, New Zealand. These deposits result from alteration of the rock, and consist chiefly of a potassium-sodium-hydronium jarosite, (K 0.56Na 0.39H + 3O 0.05) (Al 0.16Fe 0.84) 3 (SO 4) 2(OH) 6 and akaganéite, β-FeOOH, with lesser amounts of goethite, α-FeOOH, in some cases.
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