Teschenite Explained

Teschenite is a type of coarse or medium grained igneous rock akin to gabbro or dolerite and containing essential analcime. Its name is derived from the town of Český Těšín, where it was discovered. The term crinanite has previously been used as a synonym for teschenite,^[1] (particularly with increased analcime content) but there have been attempts to standardise terminology by stopping its use.^{[2] [3]} Rocks related to teschenite are referred to as rocks of the teschenite association.^[4]

Geological composition

Teschenite comprises essential titan-augite, analcime, labradorite and olivine and may include hornblendes.^{[5] [6]} Teschenite also has subtypes such as cuyamite and lugarite.^[7]

History

Teschenite was first described and given a name by in 1861.^[8]

In 1866 teschenite occurrences with higher concentrations of magnesium were defined as picrite by Erich von Tschermak.

Until 1892 the name in use for the rock was tchesenit, which is derived from the German name for Český Těšín. The name teschenite (těšínit in Czech) was first used by mineralogist ^[9]

In 1918 the same name was declared official by František Slavík.^{[10] [11]}

Location of occurrence

Teschenite has been found in Scotland, Portugal, the Caucasus Mountains, Siberia, Kenya, Myanmar, Taiwan, Australia and New Zealand.^[12]

In the Czech Republic, teschenite is primarily found in the volcanic region of the Beskids which stretch from the borders of Moravia to regions east of Český Těšín. Specific documented deposits are in Tichá, in the basin of the Ostravice river, in the Řepiště municipality and in a quarry near Žermanice Reservoir.^{[13] [14] [15] [16]} Historically, olivine-rich teschenite has also been mined in an old quarry in Straník.^[17]

Notes and References

1. Web site: www.mindat.org . April 27, 2024 . mindat.org.
2. Wilkinson . J. F. G. . August 1955 . The Terms Teschenite and Crinanite . Geological Magazine. 92 . 4 . 282–290 . 1955GeoM...92..282W . 10.1017/S0016756800064323 . 1469-5081.
3. Web site: Crinanite, western Scotland . 2024-04-27 . turnstone.ca.
4. Využívání hornin těšínitové asociace v pravěku . Masaryk University, Faculty of Science . 2006 . cs . Irena . Čípová.
5. Book: Ferdinand, Zirkel . Lehrbuch der Petrographie . Engelmann . 1894 . 9780559745102 . 2nd . Leipzig . 678-685 . de.
6. Web site: Teschenite . April 27, 2024 . mindat.org.
7. Wilkinson . J. F. G. . August 1955 . The Terms Teschenite and Crinanite . Geological Magazine. 92 . 4 . 282–290 . 10.1017/S0016756800064323 . 1955GeoM...92..282W . 1469-5081.
8. Web site: 160 let od úmrtí geologa a paleontologa Ludwiga Hoheneggera. 2024-04-26 . osel.cz . cs.
9. Web site: 10 November 2013 . Nerosty vulkanických hornin . April 24, 2024 . moravske-karpaty.cz . cs.
10. Web site: Hruban . Robert . November 10, 2013 . Nerosty vulkanických hornin . April 24, 2024 . moravske-karpaty.cz . cs.
11. Web site: Budínská . Gabriela . October 31, 2017 . ic-tesin.cz . April 24, 2024 . Turistické informační centrum Český Těšín . cs.
12. Web site: Navrátilová . Mirka . TĚŠÍNIT . https://web.archive.org/web/20240424144205/http://petrol.sci.muni.cz/poznavanihornin/magmatity/tesinit.htm . April 24, 2024 . 2024-04-27 . petrol.sci.muni.cz. cs.
13. Web site: Petránek . Jan . Podbeskydská vulkanická oblast. Geologická encyklopedie . 2024-04-27 . Česká gelogická služba. cs.
14. Web site: Podbeskydská vulkanická oblast. dead . 2024-04-26 . 2021-09-18 . https://web.archive.org/web/20210918044332/https://www.frydekmistek.cz/prilohy/Texty/117902/1342532909_12_podbeskydska_vulkanicka_oblast.pdf. cs.
15. Melnyk . Anastasia . Pospíšil . Lubomil . 2022-12-20 . Geofyzikální mapování výskytu těšínitové asociace hornin v okolí Žermanic – slezská jednotka . Geologické výzkumy na Moravě a ve Slezsku . cs . 29 . 1–2 . 10.5817/GVMS2022-21299 . 2336-4378. free.
16. Web site: Těšínit - Řepiště . 2024-04-26 . sci.muni.cz. cs.
17. Web site: Schuchová . Kristýna . Bubík . Miroslav . Geopark Podbeskydí. April 26, 2024 . geoparkpodbeskydi.cz. cs.