"Limonite" Quotes from Famous Books
 ... substance, like celadonite, delessite or "green earth,'' which are hydrous silicates rich in iron, derived probably from the decomposition of the augite in the mother-rock., This green silicate may give rise by alteration to a brown oxide of iron (limonite), producing a rusty appearance on the outside of the agate-nodule. The outer surface of an agate, freed from its matrix, is often pitted and rough, apparently in consequence of the removal of the original ...
— Project Gutenberg Encyclopedia |
