Comendite
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite. Phenocrysts are sodic sanidine with minor albite and bipyrimidal quartz. Comendite occurs in the mountains Tibrogargan, Coonowrin, Tunbubudla, Coochin, Saddleback, Tibberoowuccum and Ngungun in the Glass House Mountains, South East Queensland, Australia. The blue colour is caused by very small crystals of riebeckite or arfvedsonite. Comendite also occurs in Sardinia, Corsica, Ascension Island, Ethiopia, Somalia and other areas of East Africa. The 1903 eruption of Changbaishan volcano in north-east China erupted comendite pumice.
Comendite derives its name from the area of Le Commende on San Pietro Island in Italy, where the rock type is found.

This is an excerpt from the article Comendite from the Wikipedia free encyclopedia. A list of authors is available at Wikipedia.
The article Comendite at en.wikipedia.org was accessed 230 times in the last 30 days. (as of: 06/07/2014)
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Comendite - Wikipedia, the free encyclopedia
Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite. Phenocrysts are sodic sanidine with minor albite and bipyrimidal quartz.
en.wikipedia.org/wiki/Comendite
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Petrochemical variations among mildly peralkaline (comendite ...
Eleven new analyses and modes of Comendite obsidians are presented, and compared with all available data on similar rocks. Most specimens are aphyric or  ...
link.springer.com/article/10.1007%2FBF00388955
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Download PDF - Springer
(Comendite) Obsidians from the Oceans and Continents. D. K. B~Lv.r ... Eleven new analyses and modes of Comendite obsidians are presented, and compared.
link.springer.com/content/pdf/10.1007%2FBF00388955.pdf
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Petrogenesis of basalt-comendite and basalt-pantellerite suites ...
Barbara Comendites are derived from the off-rift basalts. A compositional gap .... line pantellcrite and Comendite; rock namcs were assigned using the alkali-silica  ...
www.es.utoronto.ca/Members/mungall/mungal-pub-pdf/Mungall_Martin_Contribs_1995.pdf
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What Is the Definition of Comendite - Ask.com
Comendite is a hard peralkaline igneous rock which is a blue grey rhyolite. It occurs in mountainous areas such as Tibrogargan, Coonowrin, Tunbubudla, ...
www.ask.com/question/what-is-the-definition-of-comendite
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PDF, 0.52 MB - Journal of GEOsciences
DOI: 10.3190/jgeosci.118. Original paper. Petrology of the Late Cretaceous peralkaline rhyolites (pantellerite and Comendite) from Lake Chad, Central Africa.
www.jgeosci.org/content/jgeosci.118_mbowou.pdf
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File:Comendite rjw.jpg - Wikimedia Commons
English: Comendite is an alkali rhyolite, an igneous rock rich in sodium and potassium. In the Glass House Mountains of Queensland, Australia it is a light blue ...
commons.wikimedia.org/wiki/File:Comendite_rjw.jpg
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Morphology and dimensions of the young comendite lavas of La ...
Distribution of porphyritic and aphyric Comendite lavas. ... are analogous to the aphyric Comendites of La Primavera, and we now suggest that they are perhaps.
journals.cambridge.org/production/action/cjoGetFulltext?fulltextid=4489584
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Comendite | Facebook
Comendite. 2 likes · 0 talking about this. Comendite is a hard, peralkaline igneous rock, a type of light blue grey rhyolite. Phenocrysts are sodic sanidine with ...
www.facebook.com/pages/Comendite/138467572847829
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Crustal Influences in the Petrogenesis of the Naivasha Basalt ...
Comendites with the later series (LBS) erupted between Groups 5 and 6. ... The seven Comendite groups have distinct trace element and isotope systematics.
petrology.oxfordjournals.org/content/28/6/1009.full.pdf
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Comendite in science
Crustal Influences in the Petrogenesis of the Naivasha Basalt ...
The early basalt series (EBS) predates the Group 1 Comendites with the later series (LBS) erupted between Groups 5 and 6. Basalts ... Oxford University Press.
[PDF]Petrogenesis of basalt-comendite and basalt-pantellerite suites ...
Earth and Planetary Sciences, McGill University,. 3450 University Street .... line pantellcrite and Comendite; rock namcs were assigned using the alkali-silica ...
Some data on the comendite type area of S. Pietro and S. Antioco ...
Some data on the Comendite type area of S. Pietro and S. Antioco islands, Sardinia ... Ist. di Mineralogia e Petrografia, University of Pisa and Centro di Geologia ...
[PDF]Download PDF - Springer
Department of Geology, University of Reading, England. Abstract. Eleven new analyses and modes of Comendite obsidians are presented, and compared.
Petrochemical variations among mildly peralkaline (comendite ...
Eleven new analyses and modes of Comendite obsidians are presented, and compared with all .... 1. Department of Geology, University of Reading, England ...
[PDF]occurrence of arfvedsonite comendite from oga peninsula ... - J-Stage
of his reconnaissance geologic survey of Oga peninsula,. Akita. Prefecture,. Dr. Ryuji. Sugiyama, then of Niigata. University collected a block of Comendite from.
Loss of Sodium from Crystallized Comendite Welded Tuffs of the ...
Crystallized Comendites, pantellerites, and “alkali granites” almost invariably have significantly lower Na2O contents than do Comendite and pantellerite glasses ...
Petrochemical variations among mildly peralkaline (comendite ...
Petrochemical variations among mildly peralkaline (Comendite) obsidians from the oceans and continents. D. K. Bailey, R. Macdonald. University of Reading ...
Systematic variation of major elements in comendite and pantellerite ...
SAO/NASA ADS Astronomy Abstract Service.
[PDF]PDF, 0.52 MB - Journal of GEOsciences
and Comendite), consisting of quartz ± alkali feldspar ± fluoro-arfvedsonite ± augite–hedenbergite ± aegirine ± fayalite ...... University of Edinburgh, pp 1–347.
Books on the term Comendite
United States Geological Survey Professional Paper
United States Geological Survey Professional Paper
1903
Rhyolite Comendite Rhyolite ....do Granitite Rhyolite Granite Comendite Rhyolite Obsidian Granite Granite-porphyry . . . Granitite Paisanite Granite-porphyry. . . Syenite- porphyry. . . Apilte-granite Granite ....do do do Cape Ann, Mass I J. G. VI,  ...
Chemistry of Igneous Rocks: Chemial Analyses
Chemistry of Igneous Rocks: Chemial Analyses
Ray MacDonald, David Kenneth Bailey, 1973
Colin, is collection number; lab., laboratory number. Rock names used below are those applied by the original authors. ComenditeS EUROPE Sardinia 1. Comendite, Le Fontane, Isola San Pietro. Analyst: E. G. Zie8 (fluorine by V. C. Smith).
Alkaline Rocks and Carbonatites of the World: Africa (Pt. 3)
Alkaline Rocks and Carbonatites of the World: Africa (Pt. 3)
2001
Apart from their scientific interest, the alkaline rocks and carbonatites are of major, and growing, economic importance. They are significant repositories of certain metals and commodities, indeed the only source of some of them, including Nb, the rare earths, Cu, V, diamond phosphate, vermiculite, bauxite, raw materials for the manufacture of cer...
Igneous rocks: composition, texture and classification, ...
Igneous rocks: composition, texture and classification, ...
Joseph Paxson Iddings, 1920
When in notable amount the rock has been called quaktz-pantellerite. Comendite .1 — Chiefly quartz, alkali-feldspar, with a"girite, arfvedsonite or riebeckite, biotite, and brown hornblende. Porphyritic, with lithoidal groundmass. Dacite1 (in part) ...
The Gregory Rift Valley and Neogene-Recent Volcanoes of Northern Tanzania - Memoir no 33 (Memoir (Geological Society...
The Gregory Rift Valley and Neogene-Recent Volcanoes of Northern Tanzania - Memoir no 33 (Memoir (Geological Society...
2009
The structure and volcanic activity of the northern Tanzania sector of the Gregory Rift Valley have hitherto been less well described than those in Ethiopia and Kenya. This book focuses on northern Tanzania where, although the volcanic area is smaller than those to the north, there are major features such as Kilimanjaro, the highest mountain on the...
Tectonics, Magmatism and Metallogeny of Mongolia
Tectonics, Magmatism and Metallogeny of Mongolia
2002
This volume provides the first systematic description of the most important geological structures of Mongolia and discusses the main features of these structures and their interactions. The main characteristics of magmatism are described for each stage of tectonic development and the evolution of magmatism is considered with reference to lithospher...
The Mojave-Sonora Megashear Hypothesis: Development, ...
The Mojave-Sonora Megashear Hypothesis: Development, ...
Thomas Howard Anderson, 2005
Three Comendite samples from the Mulberry Wash Formation (marked with arrows) contain >1000 μg/g Zr; plotted values of Zr/TiO2 are minimums. In B, all rhyolite samples contain
Magmatism and Geodynamics: Terrestrail Magmatism Throughout the Earth's History
Magmatism and Geodynamics: Terrestrail Magmatism Throughout the Earth's History
2000
Magnatism is the only true endogenic process for generating new material on the Earth's surface. Obviously, magmatism and tectonic movements are reflections of geodynamics, that is, physical processes which occur in deep-seated environments. What are the interrelationships between magmatism and tectronics? How did the character of terrestrial ...
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Comendite
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SVP si budweiser voir cela une Comendite serasi grandement aprécier
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Igneous rocks are classified by using grainsize, silica content, and/or silica saturation. Other methods of classification include the International Union of Geological Sciences (IUGS) scheme and the Total Alkalies vs Silica scheme. Grainsize Based on the predominant grainsize that reflects the depth at which molten rocks form within the Earth. Three types of rock can…
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