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Jakub Jirásek's Photo Gallery

Šiatorská Bukovina Quarry

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Šiatorská Bukovinka, Lučenec District, Banská Bystrica Region, Slovakia

Šiatorská Bukovina Quarry, August 2019.
Copyright: © Jakub Jirásek, 2019      Photo ID: 1037446     Uploaded by: Jakub Jirásek   View Count: 10   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

W0T-VKNTintinaite Pb22Cu4(Sb,Bi)30S69 , Tetrahedrite Cu6(Cu4X2)Sb4S13 , Quartz SiO2 , Siderite FeCO3

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Strieborná vein, Mária Mine, Rožňava, Rožňava Co., Košice Region, Slovakia

Dimensions: 5.5 cm x 4 cm
Largest Crystal Size: 25 mm

Great example or rare sulphosalt tintinaite. Metallic grey needles 25 mm long and ca. 2 mm thick in the quartz with minor tetrahedrite and siderite. 2019 find, purchased at the Ostrava Mineral Show.

Copyright: © Jakub Jirásek, 2019      Photo ID: 1024572     Uploaded by: Jakub Jirásek   View Count: 21   Approval status: Public galleries    Type: Photo - 4015 x 2961 pixels (11.9 Mpix)

0KL-8EXQuartz SiO2

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Jeřmanice, Liberec District, Liberec Region, Czech Republic

Dimensions: 6 cm x 5 cm

Quarz vein with small vug and quartz crystal. Minor black tourmalines visible at the left side, near the contact with rhe wall-rock.
Copyright: © Jakub Jirásek, 2019      Photo ID: 1024567     Uploaded by: Jakub Jirásek   View Count: 11   Approval status: Public galleries    Type: Photo - 3652 x 2771 pixels (10.1 Mpix)

28P-UVRTuffaceous-siltstone

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Paskov Mine, Frýdek-Místek District, Moravian-Silesian Region, Czech Republic

Dimensions: 19.5 cm x 16 cm

So-called Main Ostrava Whetstone - the thickest and most widespread volcanoclastic horizon of the Upper Silesian Basin (Czech Republic and Poland). Ripples marked by brownish (after weathering) siderite cement indicate variable and dynamic hydrodynamic conditions during the sedimentation. U-Pb isotopic age from zircons is 327.35 ± 0.15 Ma (Upper Carboniferous, Serpukhovian Stage).

Ref.: Jirásek J. et al. (2013): The Main Ostrava Whetstone: composition, sedimentary processes, palaeogeography and geochronology of a major Mississippian volcaniclastic unit of the Upper Silesian Basin (Poland and Czech Republic). International Journal of Earth Sciences, 102, 989-1006.

Copyright: © Jakub Jirásek, 2018      Photo ID: 1021575     Uploaded by: Jakub Jirásek   View Count: 30   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

LJL-J9ATonstein

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9. květen Mine, Darkov Mine, Karviná District, Moravian-Silesian Region, Czech Republic

Dimensions: 17.5 cm x 9 cm

Coal tonstein of Seam No. 678 of the Upper Silesian Basin. Upper Carboniferous age (Bashkirian stage). Collection of Geological pavilon of prof. F. Pošepný at VŠB-Technical University of Ostrava.

Copyright: © Jakub Jirásek, 2018      Photo ID: 1021574     Uploaded by: Jakub Jirásek   View Count: 26   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

W6J-W03Tonstein

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Julius Fučík Mine, Petřvald, Nový Jičín District, Moravian-Silesian Region, Czech Republic

Dimensions: 15 cm x 14 cm

Coal tonstein of Seam No. 365 (15th Petřvald Coal, Gabriela) of the Upper Silesian Basin. Interesting is root clay at the uppermost part of the sample, indicating coal-vegetation growth directly after the ashfall. U-Pb isotopic age of zircons from this tonstein yielded age 325.64 Ma - Upper Carboniferous age, Serpukhovian stage. Collection of Geological pavilon of prof. F. Pošepný at VŠB-Technical University of Ostrava.
Copyright: © Jakub Jirásek, 2018      Photo ID: 1021573     Uploaded by: Jakub Jirásek   View Count: 12   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

5UH-7PFTonstein

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Rudý ríjen Mine, Ostrava, Ostrava-City District, Moravian-Silesian Region, Czech Republic

Dimensions: 15 cm x 12.5 cm

Coal tonstein of Seam No. 243 (Horymír) of the Upper Silesian Basin. Only the lower intercalation contains volcanoclastic minerals and, therefore, could be considered as a coal tonstein. Upper intercalation is comon clay band containing just terrestrial material. Upper Carboniferous age (Serpukhovian stage). Collection of Geological pavilon of prof. F. Pošepný at VŠB-Technical University of Ostrava.
Copyright: © Jakub Jirásek, 2018      Photo ID: 1021572     Uploaded by: Jakub Jirásek   View Count: 18   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

Rumisko Hill Quarry

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Rumisko Hill Quarry, Horní Tašovice, Bochov, Karlovy Vary District, Karlovy Vary Region, Czech Republic

Panoramic view of the quarry.
Copyright: © Jakub Jirásek, 2019      Photo ID: 1004366     Uploaded by: Jakub Jirásek   View Count: 14   Approval status: Public galleries    Type: Photo - 10172 x 3026 pixels (30.8 Mpix)

Angular unconformity

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Železná hůrka, Mýtina, Cheb District, Karlovy Vary Region, Czech Republic

Angular unconformity between two types of volcanic scoria.
Copyright: © Jakub Jirásek, 2019      Photo ID: 1004365     Uploaded by: Jakub Jirásek   View Count: 25   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)

Scoria cone

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Železná hůrka, Mýtina, Cheb District, Karlovy Vary Region, Czech Republic

Scoria cone exposed in the walls of old quarries. Now protected as Natinal Natural Monument.
Copyright: © Jakub Jirásek, 2019      Photo ID: 1004364     Uploaded by: Jakub Jirásek   View Count: 8   Approval status: Public galleries    Type: Photo - 5184 x 3456 pixels (17.9 Mpix)
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