Thermal analysis of smithsonite and hydrozincite
Frost, Ray L. & Hales, Matthew C. (2008) Thermal analysis of smithsonite and hydrozincite. Journal of Thermal Analysis and Calorimetry, 91(3), pp. 855-860.
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Abstract
Thermogravimetric analysis of synthetic smithsonite and hydrozincite, two secondary minerals of zinc, was used to determine their relative thermal stability. Thermal decomposition of smithsonite occurs at 293 degrees Celsius and hydrozincite at 220 degrees Celsius showing that the carbonate mineral is more stable than the hydroxy-carbonate mineral hydrozincite. Hot stage Raman spectroscopy confirms the decomposition of smithsonite and hydrozincite by 300 and 250 degrees Celsius respectively. Thermogravimetry shows that a small amount of hydrozincite is formed during the synthesis of smithsonite. No evidence is found for the separate loss of the carbonate and hydroxyl units from hydrozincite.
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