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300. 300. Quartz. 250. 250. Tridymite. Chalcedony. 200. 200. Cristobalite. Amorphous silica. T (°C). T (°C). 150. 150. 100. 100. 50. 50. 0. 0. –5. –4. –3. –2. –1. –5. log a SiO. log a SiO. (aq). (aq). 2. 2. Config → Suppress…. Solubility of Quartz.

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  1. 300 300 Quartz 250 250 Tridymite Chalcedony 200 200 Cristobalite Amorphous silica T (°C) T (°C) 150 150 100 100 50 50 0 0 –5 –4 –3 –2 –1 –5 log a SiO log a SiO (aq) (aq) 2 2

  2. Config → Suppress… Solubility of Quartz

  3. Suppress Quartz to allow less stable silica polymorphs to form.

  4. Suppressing Quartz allows Tridymite and Chalcedony to form.

  5. 300 300 Quartz 250 250 Tridymite Chalcedony 200 200 Cristobalite Amorphous silica T (°C) T (°C) 150 150 100 100 Figure created by sequentially suppressing the most stable phase, then copying into PowerPoint. 50 50 0 0 –5 –4 –3 –2 –1 –5 log a SiO log a SiO (aq) (aq) 2 2

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