Definitions for nephelinite
ˈnɛf ə ləˌnaɪtnepheli·n·ite

Princeton's WordNetRate this definition:0.0 / 0 votes

1. nephelinitenoun

   an igneous rock consisting of nepheline and pyroxene

WiktionaryRate this definition:0.0 / 0 votes

1. nephelinitenoun

   a dark, finely crystalline rock of volcanic origin, being a mixture of nepheline and pyroxene

WikipediaRate this definition:0.0 / 0 votes

1. Nephelinite

   Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene (variety augite). If olivine is present, the rock may be classified as an olivine nephelinite. Nephelinite is dark in color and may resemble basalt in hand specimen. However, basalt consists mostly of clinopyroxene (augite) and calcic plagioclase. Basalt, alkali basalt, basanite, tephritic nephelinite, and nephelinite differ partly in the relative proportions of plagioclase and nepheline. Alkali basalt may contain minor nepheline and does contain nepheline in its CIPW normative mineralogy. A critical ratio in the classification of these rocks is the ratio nepheline/(nepheline plus plagioclase). Basanite has a value of this ratio between 0.1 and 0.6 and also contains more than 10% olivine. Tephritic nephelinite has a value between 0.6 and 0.9. Nephelinite has a value greater than 0.9. Le Maitre (2002) defines and discusses these and other criteria in the classification of igneous rocks. Nephelinite is an example of a silica-undersaturated igneous rock. The degree of silica saturation can be evaluated with normative mineralogy calculated from chemical analyses, or with actual mineralogy for completely crystallized igneous rocks with equilibrated assemblages. Silica-oversaturated rocks contain quartz (or another silica polymorph). Silica-undersaturated mafic igneous rocks contain magnesian olivine but not magnesian orthopyroxene, and/or a feldspathoid. Silica-saturated igneous rocks fall in between these two classes.

ChatGPTRate this definition:0.0 / 0 votes

1. nephelinite

   Nephelinite is a rare type of extrusive igneous rock or volcanic rock, rich in alkali metals such as sodium and potassium, and characterized by the presence of nepheline and pyroxene. It is light grey to black in color and fine-grained in texture. It is often associated with carbonatite occurrences and is relatively rare compared to the more common basaltic and granitic rocks.

WikidataRate this definition:0.0 / 0 votes

1. Nephelinite

   Nephelinite is a fine-grained or aphanitic igneous rock made up almost entirely of nepheline and clinopyroxene. If olivine is present, the rock may be classified as an olivine nephelinite. Nephelinite is dark in color and may resemble basalt in hand specimen. However, basalt consists mostly of clinopyroxene and calcic plagioclase. Basalt, alkali basalt, basanite, tephritic nephelinite, and nephelinite differ partly in the relative proportions of plagioclase and nepheline. Alkali basalt may contain minor nepheline and does contain nepheline in its CIPW normative mineralogy. A critical ratio in the classification of these rocks is the ratio nepheline/. Basanite has a value of this ratio between 0.1 and 0.6 and also contains more than 10% olivine. Tephritic nephelinite has a value between 0.6 and 0.9. Nephelinite has a value greater than 0.9. Le Maitre defines and discusses these and other criteria in the classification of igneous rocks. Nephelinite is an example of a silica-undersaturated igneous rock. The degree of silica saturation can be evaluated with normative mineralogy calculated from chemical analyses, or with actual mineralogy for completely crystallized igneous rocks with equilibrated assemblages. Silica-oversaturated rocks contain quartz. Silica-undersaturated mafic igneous rocks contain magnesian olivine but not magnesian orthopyroxene, and/or a feldspathoid. Silica-saturated igneous rocks fall in between these two classes.

Matched Categories

1. • Mineral

How to pronounce nephelinite?

1. Alex

   US English

   David

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   Mark

   US English

   Daniel

   British

   Libby

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   Mia

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   Karen

   Australian

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   Australian

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   Neerja

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Numerology

1. Chaldean Numerology

   The numerical value of nephelinite in Chaldean Numerology is: 2

2. Pythagorean Numerology

   The numerical value of nephelinite in Pythagorean Numerology is: 9

References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=nephelinite
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Nephelinite
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Nephelinite
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=nephelinite