Abstract
IN many soils there are small siliceous bodies showing optical isotropy, low refractive index and low density, which identify them with the mineral opal, SiO2.nH2O1. Some are diatoms or diatom fragments. Others are simple or ornamented rods, tubes, hooks, etc., resembling the opaline bodies which are components of many plants2–4. Van Rummelen5 has figured rods and tubes of isotropic silica from Indonesian soils and has suggested that such particles are always of inorganic origin, being deposited around root hairs which afterwards decay or in soil capillaries. Oosov6 has observed biologically accumulated silica in Russian soils.
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