The wearing away by surface friction of solid bodies (minerals and rocks for example) when brought into contact with each other by such agents of erosion as wind, water, ice or animals (including Homo sapiens). The reaction of a mineral with water at an abraded surface yields a characteristic pH. A typical range of abrasion pH is 6–7 for clay minerals and quartz, 7–8 for micas, 8 for calcite, 8–11 for silicates other than micas (Porta et al., p 442).
- Porta, J., Lopez, M., and Roquero, C., 1994. Edafologia para la agricultura y el medio ambiente. Madrid: Editions Mundi‐Prensa, 807 pp.Google Scholar