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friable and porous. The guide told us that these stones in Goias, where they are called "potatoes", are considered to be characteristic indications of gold, and that here too this metal has already been washed, albeit to a lesser extent. Then, further on, we found the existence of large deposits of shale, calcic, light-lilac clay, which usually appear in the formation of stone.
Mica shale
juazeiro, under which we had placed our boxes, had stood firmly and, with its closed fronds, had sheltered us so well that the next morning we could go on, so to speak, safe and sound. However, the heavy cold caused by the rain, had a very harmful effect on our employees, and the fever attacked several of them.
Topa mountain ? To the north of Serrinha rises, in the main direction from east to west, the mountain called Topa, of earthen planes, and consisting of a white or pale red limestone. We left these beautiful slopes on our right, and entered a vast plateau, whose vegetation of grassland catinga gradually became open fields of extreme charm. Fine grasses and flowers of the vegetation of the mimosos fields stood out 258
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