Studies on Agate: Microscopy, Spectroscopy, Growth, High Temperature, and Possible Origin

摘要

[...] he has been doing this for thirtyfive years; it is his passion. [...] the question was posed, did a correlation exist between the age and the coarseness of agates? Small concentrations of iron (or other ionic species) in the colloidal silica solutions can change the average charge balance of colloidal silica particles and cause the precipitation of silica.