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Abstract

The rocks quarried in the neighboring Rutki and Ligota Tułowicka deposits (vicinity of Niemodlin) represent a single petrographic variety of basalt, i.e. nephelinite. The presence of nepheline (the mineral belonging to the group of feldspathoids) that forms the light-colored component of the groundmass is the characteristic feature of these rocks. Nepheline is accompanied by fine crystals of pyroxene and, occasionally, magnetite. Distinctly larger pyroxene and olivine phenocrysts are dispersed within the groundmass. Neither minerals of the groundmass nor the phenocrysts of the pyroxenes reveal any signs of chemical weathering. However, such alterations are clearly visible in the phenocrysts of olivine. The basalt raw materials of both deposits are utilized mainly for the production of various assortments of crushed road aggregates and as components of concretes. These applications require the aggregates with the grain sizes >2 mm. There is also a possibility to utilize coarse-grained basalt aggregates for the manufacturing of rock wool. This is due to a favorable property of the rocks from Rutki and Ligota Tułowicka that is their relatively low content of magnetite resulting in the low capability of the molten basalt to crystallize. The chemical weathering of the olivine phenocrysts have proceeded toward the formation of clay minerals, among which those of the smectite group prevail. Their elevated quantities occur in the finest aggregate assortment, i.e. 0–0.85 mm. The fineness of this grain fraction and its elevated quantity of clay minerals are two favorable features to utilize this part of the basalt aggregate by the heavy clay industry as an additive improving the physico-mechanical parameters and providing the required red color of ceramic products..

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Authors and Affiliations

Piotr Wyszomirski
Tadeusz Szydłak
Tomasz Zawadzki
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Abstract

Feldspar raw materials belong to such raw materials for which demand has risen in Poland in the last years to a largest extent. The reason of it is the expansion of domestic branch of ceramic tiles. Larger and larger demand of the Polish industry of ceramic tiles for feldspar raw materials is covered among others in greater and greater extent by import from Turkey. Feldspar raw materials in that country are mainly obtained from albite-rich rocks which occur in the west part of the country in Menderes Massif particularly in its south fragment (Submassif Çine). Their exploitation and proccessing are carried out by many companies from which KALTUN, ESAN ECZACIBASI, ÇINE AKMADEN, KALEMADEN and ERMAD are of the greatest importance in the Polish market. The raw material of the highest quality [...] is obtained as a result of benefication of primary rocks by flotation. The main compounds - apart from quartz - of studied samples analized by means of microscopic method are feldspars represented first of all by albite. This mineral occurs in two varieties. First of them - which strongly dominates - is so called chessboard albite. This variety is formed as a result of albitization of feldspars of various types. On the other hand, typical, multitwinned crystals of this mineral are observed significantly rarer. Albite most often contains 5-10 mol.% of anorthite molecule. Sporadically minor and/or trace minerals (e.g. titanite, rutile, micas) occur in samples studied. They are the carriers of colouring oxides (Fe2O3, TiO2) presence of which is outstandingly undesirable, especially in raw materials for the production of ceramic tiles of the highest quality such as gres porcellanato. The characteristic feature of the Turkish feldspar raw materials is occurrence of minor or trace amount of TiO2 in domination compared to Fe2O3 which mostly is more common colouring oxide in feldspar raw materials. It is connected with sporadic occurrence of such titanium minerals as titanite [...] and rutile TiO2. However, in the majority of investigated samples the presence of these carriers of colouring oxides was not stated which confirms the opinion about high quality of feldspar raw materials of Turkish production.

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Authors and Affiliations

Piotr Wyszomirski
Ferdynand Gacki
Tadeusz Szydłak

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