Cristobalite is a high-temperature polymorph of silica, occurring naturally in volcanic rocks and as a product of industrial processes. It is a member of the silica mineral family, which includes quartz, tridymite, and coesite. Cristobalite forms at temperatures above 1470°C and has a cubic crystal structure, distinct from the trigonal structure of quartz. Its formation is favored by the presence of alkali metal oxides, which act as mineralizers. Cristobalite is metastable at room temperature, meaning it does not convert to the more stable quartz structure under ambient conditions. However, prolonged exposure to high temperatures can cause a slow transformation to quartz. The mineral has a relatively low density compared to other silica polymorphs and exhibits a high thermal expansion coefficient. These properties make cristobalite useful in various industrial applications, such as refractory materials, ceramic glazes, and abrasives. However, the inhalation of cristobalite dust has been linked to silicosis, a lung disease caused by the accumulation of silica particles in the lungs. As a result, occupational health and safety measures are crucial in industries where exposure to cristobalite dust is a concern.
silica, polymorph, volcanic, refractory, ceramic, abrasive
CITATION : "John Armstrong. 'Cristobalite.' Design+Encyclopedia. https://design-encyclopedia.com/?E=434185 (Accessed on December 21, 2024)"
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