We may conclude that, in the analyses presented in the enclosed table, besides the natural existence in the same bearing, a great oscillation in every percentage: 1) the samples with quantity in MgO up to 3%, represent 58,59%, of the total analyses; from 3 to 5, 7,62%; from 5 to 10, 6,77%; and above 10, 33,05%. 2) with quantity insoluble up to 5%, 54,23%; from to 10, 16,10%; and above 10, 27, 96%. 3) of the analyses in which the dosage was made of the MnO, 47,27% gave negative result. 4) with the exception of the larger part of the white calcareous, every other one contain graphitic carbon. 5) the calcareous found in the Itaiacoca region, Ponta Grossa County, besides the mixture of magnesium silicate, there an Mg (OH)² in variable quantities. 6) although some samples found in large bearing have presented good purity, it is necessary a complete rigorous study of the samples, according to the purpose, for there exist in them a large variety, mainly in MgO. 7) due to the fact that the analyses were made with material largely send to this Instituto, the percentages figured in the above items refer only to the samples mentioned, and not an average in the State of Paraná..
Calcareous; State of Paraná; analytical chemistry
