teschenite

teschenite
/tesh"euh nuyt'/, n.
a coarse-grained igneous rock consisting of plagioclase, olivine, and augite.
[1865-70; Teschen (German name of Czech Tešín, town in Czechoslovakia) + -ITE1]

* * *

rock
      coarse- to fine-grained, rather dark-coloured, intrusive igneous rock that occurs in sills (tabular bodies inserted while molten between other rocks), dikes (tabular bodies injected in fissures), and irregular masses and is always altered to some extent. It consists primarily of plagioclase feldspar, analcime, and titaniferous augite, with barkevikite, nepheline, and olivine usually in lesser amounts. The plagioclase crystals often are encased in the augite to give teschenite an ophitic texture. The rock is named for its occurrence near Teschen (now Cieszyn, Pol.); in central Scotland it is abundant in thick sills. Teschenite grades into picrite when the olivine content increases.

* * *


Universalium. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • teschenite — /tesh euh nuyt /, n. a coarse grained igneous rock consisting of plagioclase, olivine, and augite. [1865 70; Teschen (German name of Czech Tešín, town in Czechoslovakia) + ITE1] …   Useful english dictionary

  • Geology of the Australian Capital Territory — Australia grew around three fused pieces of very ancient continental crust (cratons). The geology of the Australian Capital Territory includes rocks dating from the Ordovician around 480 million years ago, whilst most rocks are from the Silurian …   Wikipedia

  • Тешенит — [по обл. Тешен в Чехословакии] анальцимсодер. полнокристаллическая гипабиссальная и жильная меланократовая щелочная п. Состоит почти наполовину из фемических м лов: пироксена (титан авгита) и амфибола (баркевикита) и содер. в существенных… …   Геологическая энциклопедия

  • Edinburgh — For other uses, see Edinburgh (disambiguation). City of Edinburgh Scottish Gaelic: Dùn Èideann Scots: Edinburgh   Unitary Authority City   City of Edinburgh …   Wikipedia

  • Carbonatite — Carbonatites (pronEng|kɑrˈbɒnətaɪt) are intrusive or extrusive igneous rocks defined by mineralogy that comprises more than 50 volume % carbonate minerals. Carbonatites may be confused with marble, and may require geochemical… …   Wikipedia

  • Theralite — (from Greek to pursue ) is, in petrology, a group of plutonic holocrystalline rocks consisting of nepheline, basic plagioclase, augite and olivine, and so called because of its rare occurrence. Its discovery was looked forward to with interest as …   Wikipedia

  • Kambah, Australian Capital Territory — Kambah Canberra, Australian Capital Territory Population: 15,579 (2006 ce …   Wikipedia

  • Kreideformation — (Quadersandsteinformation, Grünsandformation, Glaukonitformation, cretazische oder cretazeïsche Formation; hierzu Tafel »Kreideformation I u. II«), die jüngste der Formationen in der mesozoischen Gruppe. Das der K. den Namen gebende Gestein,… …   Meyers Großes Konversations-Lexikon

  • theralite — /thear euh luyt /, n. a coarse grained, phaneritic rock composed of labradorite, nepheline, and augite. [ < Gk théra hunting + LITE; said to be so called because success in hunting it down was thought to be certain] * * * ▪ mineral       any… …   Universalium

  • τεσενίτης — ο, Ν (πετρογρ.) χονδρόκοκκο ώς λεπτόκοκκο, μάλλον σκοτεινόχρωμο, πλουτώνιο εκρηξιγενές πέτρωμα που απαντά με τη μορφή εν μέρει εξαλλοιωμένων κοιτών, φλεβών και ακανόνιστων μαζών. [ΕΤΥΜΟΛ. Μεταφορά στην ελλ. ξεν. όρου, πρβλ. αγγλ. teschenite <… …   Dictionary of Greek

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”