In modern architecture, slates, phyllites and schists are becoming more and more popular, and the example of Polish deposits of slates, phyllites and schists indicates that, in the last 10 years, the traditional method of using these rocks as raw material, e.g. for the production ofgranular surface, silty carriers of plant protection products or refractory material, has become gradually dominated by their use as dimension stones. The paper presents the first ranking of the decorative aspects, carried out for slates, phyllites and schists originating from active deposits: Orlowice, Jawornica, Dewon-Pokrzywna, Jeglowa and Jenków, located in the Sudetic Block and Fore-Sudetic Block (Lower Silesian Block, SW Poland). Evaluation of the decorative aspects of slates, phyllites and schists, which takes into account the colour, textural and structuralfeatures of the rock, its ability to be polished, and petrologic type, revealed that the primary and secondary petrographic types documented in these deposits have a high decorative value, mainly because of attractive colour and structural arrangement of mineral components. It should be noted that in the group of over 150 different varieties of colourful metamorphic slates on the stone market in the European Union, Polish slates, phyllites and schists are characterised by unique colours. Therefore, the high decorative value and unique colours characteristic of the Polish slates, phyllites and schists is their essential trait that conditions their use as decorative stone material with a wide range of applications.
Wollastonit (CaSiO3) jest minerałem używanym w wielu gałęziach gospodarki. W Europie Środkowej nie występują ważne gospodarczo złoża wollastonitu, dlatego podjęto próbę syntezy tego materiału na bazie tanich, pospolitych surowców mineralnych. Reakcje przeprowadzono metodą reakcji w stanie stałym w zakresie temperatur 1000-1300°C. Jako surowca wapiennego użyto kredy jeziornej, wapienia i kalcytu żyłowego, jako surowce krzemionkowe zastosowano piasek szklarski i łupek kwarcytowy. Najlepsze wyniki uzyskano dla materiałów na bazie kredy jeziornej i łupku kwarcytowego. Innym ważnym czynnikiem było prasowanie próbek przed syntezą – najlepsze wyniki osiągnięto dla próbek nieprasowanych.
EN
Wollastonite is a mineral used in various industries. Since there is no economically important deposits of wollastonite in Central Europe, groups of experiments were performed to prepare wollastonite based on cheap natural raw materials. The solid state reaction method was selected with interval of temperature in the range of 1000-1300°C. Lacustrine chalk, limestone and calcite veins were sources of calcium, whereas glass sand and quartzite schist were used as a source of silica. Best results were obtained for lacustrine chalk and quartzite schist. Another important factor is pressing before synthesis – better results were obtained for non-pressed samples.
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