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Carbonatite (/ kɑːrˈbɒnəˌtaɪt /) is a type of intrusive or extrusive igneous rock defined by mineralogic composition consisting of greater than 50% carbonate minerals. [ 1 ] Carbonatites may be confused with marble and may require geochemical verification. Carbonatites usually occur as small plugs within zoned alkalic intrusive complexes ...
Date free Free type Metacritic ; Barkley, Shut Up and Jam: Gaiden: Tales of Game's Studios Tales of Game's Studios RPG: Microsoft Windows, macOS: January 22, 2008 Freeware [9] 93 [10] The Battle for Wesnoth: David White and others David White and others Turn-based strategy: Microsoft Windows, macOS, Linux: October 2005 October 2005 Freeware [11 ...
The following list of PC games contains an alphabetized and segmented table of video games that are playable on the PC, but not necessarily exclusively on the PC. It includes games for multiple PC operating systems, such as Windows, Linux, DOS, Unix and OS X. This list does not include games that can only be played on PC by use of an emulator.
Specimen 7.5 cm) Sovite (or sövite) is the coarse-grained variety (or facies) of carbonatite, an intrusive, igneous rock. The fine-grained variety of carbonatite is known as alvikite. [1] The two varieties are distinguished by minor and trace element compositions. [2] Sovite is often a medium-to-coarse-grained calcite rock with variable ...
Fen Complex. Coordinates: 59°16′04″N 9°16′40″E. The Fen Complex (Norwegian: Fensfeltet) in Nome, Telemark, Norway is a region noted for an unusual suite of igneous rocks. Several varieties of carbonatite are present in the area as well as lamprophyre, ijolite and other highly alkalic rocks. It is the type locality for fenite, a ...
Gregoryite is an anhydrous carbonate mineral that is rich in potassium and sodium [5] with the chemical formula (Na 2,K 2,Ca)CO 3. [2] [6] [7] It is one of the two main ingredients of natrocarbonatite, found naturally in the lava of Ol Doinyo Lengai volcano of Arusha Region, Tanzania, and the other being nyerereite.
Fenite is a metasomatic alteration associated particularly with carbonatite intrusions and created, very rarely, by advanced carbon dioxide alteration (carbonation) of felsic and mafic rocks. It is characterised by the presence of alkali feldspar, sodic pyroxene and sodic amphibole. Fenite alteration is known, but restricted in distribution ...
Natrocarbonatite. Natrocarbonatite is a rare carbonatite lava which erupts from the Ol Doinyo Lengai volcano in Tanzania within the East African Rift of eastern Africa. Natrocarbonatite lavas were first documented in 1962, by J. B. Dawson. [1][2]