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Remember the Rainforest 1

 

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violent colic, which, according to the quartermaster, must have been caused by the tiny ticks nesting in his umbilical region; After taking a bath and applying a zinabre poultice on the spot of pain, the colic passed.

Sao Goncalo

The quartermaster intended to show us later the old diamond washing of Sao Goncalo. On the western bank of the abandoned riverbed are massive rocks of diabasio;

diabasio

on the eastern bank, the common quartzite appears. To make a way to the hidden gravel, they had tried to break the rock; it was, however, so hard that the diabasio, which resisted all efforts, and only by warming and immediate cooling with water could it be broken. Some of the larger blocks have been removed by powerful machinery. However, this work lasted for six months and no diamond was obtained. The only profit was to confirm the fact that, in the meeting of two streams, or in the place, where, as here, the Waters have great fall, there is no gravel containing diamonds.

It had only been proven to be rich with invisible but painfully sensitive body ticks.

All fellow travelers were forced to get rid of this plague by fumigating smoke leaves moistened and heated over embers. We set off, back to Tejuco, where our kind friends, warned by the bonfire we had set burning on the mountain, came to meet us, to congratulate us cordially. The various excursions in the Diamantino District, especially the ascent to its highest mountain, the Itambe, gave us the opportunity to get to know closely the particularities of this wonderful region, both in reference to Mineralogy, Botany and Zoology.

View from Itambe peak

The orogenic formation of this territory was almost the same as the general fields we had traveled. Werner ventured the assumption that East Indian-type diamonds, which are found in iron-containing sand not far from mountains with large quartz deposits, must belong to the formation of Trapean horizontal layers or sedimentary terrain. Whatever determines the appearance of diamonds in the East Indies, one thing seems certain, that the ones from Brazil do not exist in this trapean formation. With this orogeny, in Brazil, as far as we know, a simple

Diorite

diorite occurs, which we observed only in a few single pieces in the formation of

the Montes Altos diorite in the province of Bahia, both pieces found in some geological relation to diamonds. The idea that Brazilian diamonds were transported from the Peruvian mountains by the waters of the Trapanian deposits, so prevalent there, cannot be accepted by anyone. Finally, whatever the

Quartz schist

case may be, it is true that in one and the same formation of the quartz schist, at the core of the mountains of the Brazilian continent, over a length of more than twelve degrees, that the diamonds appear,

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