In what south american country have hydrolyte geodes been found

Hydrolyte geodes have been found in Brazil.

Explanation:

Hydrolyte geodes which are agate, amethyst and quartz have been found in South American continent in country Brazil. These are geological secondary formation in which the masses of matter of minerals which might also include crystals are not seen.

In physical appearance, they are hollow, and are roughly formed circular rocks and are formed within sedimentary and volcanic rocks and they are subjected to to hydrolysis.