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Mineralogy and firing characteristics of some Egyptian talc-serpentinite rocks
Published in Adam Piestrzyński, Mineral Deposits at the Beginning of the 21st Century, 2001
Ma. Abou El Maaty, A.G.M. Othman, Ma. Serry
Serpentinites, talcose rocks and talc deposits of El-Naba and El-Thamila El-Zarka areas which situated in the central part of the Egyptian Eastern Desert between latitudes 25° 8ˋ and 25°11ˋN and longitude 34° 20ˋ and 34° 28ˋ E are studied (Fig. 1). These rocks occur as irregular masses and shear pods structurally emplaced within metavolcanic rocks in both areas and are generally associated with talc-carbonate and talc chlorite rocks Two types of serpentinites were distinguished in the southern part of Wadi El-Naba: a relatively soft greyish and brown serpentinite as well as hard greenish one. Talc-carbonate bodies are soft, light-creamy or buff in colour and exhibit characteristic cavernous appearance. At Wadi El-Thamila El-Zarka, talc is exposed as lense-like bodies associated with talc rocks.
Particulate matter characteristics, dynamics, and sources in an underground mine
Published in Aerosol Science and Technology, 2018
S. Saarikoski, K. Teinilä, H. Timonen, M. Aurela, T. Laaksovirta, F. Reyes, Y. Vásques, P. Oyola, P. Artaxo, A. S. Pennanen, S. Junttila, M. Linnainmaa, R. O. Salonen, R. Hillamo
In addition to the XRF analysis, the MOUDI substrates were analyzed for water-soluble inorganic ions (Figure S10). The size distributions for sulfur and sulfate analyzed with the EDXRF and IC methods, respectively, were very similar to each other. Thus, it can be concluded that most of the total sulfur consisted of water-soluble sulfate in both the April and the June samples. In April, also the size distributions for chloride, sodium, potassium, and calcium were similar with the two analytical methods. Magnesium was an exception in both April and June. With magnesium, the difference in the particle size distributions was probably due to its partial appearance in the form of talc that is water-insoluble. In June, there were generally more differences in the particle size distributions of chemical species between the two analytical methods (except for sulfur/sulfate) than in April. In June there were increased other activities than the usual operational mining of Cr-rich ore as new tunnels at 600 m below the ground level were constructed. That probably released more mineral dust to the mine air than in April. It should be noted here that the actual mass concentrations associated with elements can be higher than just the concentrations of corresponding elements because they appeared as various compounds in soil and rock. For example, stone outside of ore deposit was composed of granite and talc carbonate. Ore itself contained 25%–29% of Cr2O3.
A proposal for the definition, nomenclature, and classification of soapstones
Published in GFF, 2018
The rocks consist mainly of talc and carbonate, whose percentages can vary in the range of 35–65%. The majority of these rocks contain 40–50% carbonate. Serpentine and amphiboles are atypical components in these rocks, but modal chlorite content may be up to 5% but usually stays under 2%. Modal oxides are typically below 10%. Analyzed talc–carbonate rocks contained on average 48.6% talc, 42.7% carbonate, 1.7% chlorite, 6.3% oxide ore minerals, and 0.4% sulfides.