| 1. | Sulfur deposits generated from hydrothermal alteration are found on Cerro Tuzgle.
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| 2. | Halloysite typically forms by hydrothermal alteration of alumino-silicate minerals.
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| 3. | Some parts of the Southern Spur display evidence of hydrothermal alteration.
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| 4. | The colors in the canyon are also a result of hydrothermal alteration.
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| 5. | It also occurs as a hydrothermal alteration product of corundum and nepheline.
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| 6. | Various parts of the main volcano have been subjected to hydrothermal alteration.
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| 7. | It has undergone some hydrothermal alteration that gives it a greenish colour.
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| 8. | It forms by hydrothermal alteration of primary feldspar minerals.
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| 9. | Additionally, the index can be positively skewed in regions of hydrothermal alteration.
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| 10. | Some hydrothermal alteration, partly associated with fumarolic activity, is present however.
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