@ARTICLE{Kobylec_Katarzyna_Lower_2008,
 author={Kobylec, Katarzyna},
 number={No 2},
 pages={59-72},
 journal={Gospodarka Surowcami Mineralnymi - Mineral Resources Management},
 howpublished={online},
 year={2008},
 publisher={Komitet Zrównoważonej Gospodarki Surowcami Mineralnymi PAN},
 publisher={Instytut Gospodarki Surowcami Mineralnymi i Energią PAN},
 abstract={The paper presents the interpretation of results of field research, petrographic analyses and technological investigations of Lower Jurassic sandstones, occurring in Przysucha and Opoczno area. As the consequence of field research, carried out at the area of 200 krn-, five quarries were located. The extraction of two of them was abandoned, while the raw material from the remaining three has been still utilized by the local people (in two cases without required exploitation license). Sandstones from examined quarries belong to the Skloby Series (Kamienna Góra and Ruszkowice deposits), Ostrowice Series (Brzuśnia and Mroczków Gościnny deposits) and Gielniów Series (Skrzynno deposit). They are predominantly of light grey or yellow colour (pink ones occur only in Mroczków Gościnny deposit), fine-to medium grained with rare visible cross-bedding or lamination. Thickness of the beds is from few centimeters to about one meter. On the base of the microscopic analyses these sandstones were classified as quartz arcnitcs. Their grain' components are mainly detritic quartz and small amounts of fragments of rocks (mainly siliceous), micas and feldspars, which arc cemented by the silica, clay minerals and iron compounds in various proportions. The physical and mechanical properties of these rocks, which were determined, make them appropriate for building purposes. Sandstones have middle and high density (from 1960 to 2700 kg/rn-), low and middle water absorption (from 2.8 to 9.7%), and low and middle compression strength (from 23.8 to 121 MPa). They can be also utilized as architectonic stone, but estimation of block divisibility show, that mainly Skrzynno deposit is suitable for extraction ofblocks -roughly 35% of the rock can be extracted as blocks of above 0.4 m3 volume. Sandstones from the other deposits arc appropriate for the production of smaller dimension and split tiles. Additionally, low compression strength (about 30 MPa) of rocks from Skrzynno makes them very desirable material for sculpturing.},
 type={Artykuł},
 title={Lower jurassic sandstones occurring in Przysucha-Opoczno area, their lithology and possibility of utilization},
 URL={http://journals.pan.pl/Content/133497/PDF-MASTER/6_GSM_24_2_1_2008_Kobylec_Dolnojurajskie.pdf},
 keywords={Jurassic sandstones, building stones, decorative stones, northern periphery of the Holy Cross Mountains},
}