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feldspathoid

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feldspathoid
@@@LINK=felspathoid Oxford English Dictionary
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Feldspathoid
Foid, a contraction of the term feldspathoid, is applied to any igneous rock containing up to 60% modal feldspathoid minerals. Feldspathoid minerals Sodalite Group References Tectosilicates wikipedia.org
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felspathoid
feldspathoid, felspathoid Min. (ˈfɛldspəθɔɪd, ˈfɛlspəθɔɪd) [f. fel(d)spath (see feldspar, felspar) + -oid.] Any of a group of minerals chemically similar to the feldspars, but containing less silica. Hence ˌfel(d)spaˈthoidal a.1896 J. F. Kemp Handbk. Rocks i. 6 (heading) Feldspathoids. With the feld... Oxford English Dictionary
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Cancrinite
It is classed as a member of the feldspathoid group of minerals; the alkali feldspars that are poor in silica. wikipedia.org
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felsic
felsic, a. Min. (ˈfɛlsɪk) [f. feldspar + lenad (= feldspathoid) + silica + -ic.] Of or pertaining to such light-coloured minerals as the feldspars, the feldspathoids, quartz, and muscovite, or to rocks containing a high proportion of these or similar minerals.1912 W. Cross et al. in Jrnl. Geol. XX. ... Oxford English Dictionary
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Shonkinite
It is unique in having low silica, feldspathoid minerals, and large blocky crystals of black augite. More specifically, it is a mafic foidal (feldspathoid bearing) syenite, a holocrystalline (completely crystalline) intrusive rock which, , is composed wikipedia.org
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Basanite
Of its total content of quartz, feldspar, and feldspathoid (QAPF), between 10% and 60% by volume is feldspathoid and over 90% of the feldspar is plagioclase wikipedia.org
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Trachybasalt
Geological Survey defines trachybasalt as a mafic volcanic rock (composed of over 35% mafic minerals) in which the quartz-feldspar-feldspathoid fraction of the rock is less than 20% quartz and less than 10% feldspathoid, and in which plagioclase is between 65% and 90% of the total feldspar content. wikipedia.org
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FOID
firearms), a firearm owner's identification card in Illinois Form of identification, used in the travel industry as a term for an identity document Feldspathoid wikipedia.org
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似长石
似长石（feldspathoid）是一组类似长石，但结构不同，二氧化硅含量低得多的网硅酸盐矿物。它们出现在罕见的火成岩中，通常在主要含石英的岩石中找不到，但一则值得注意的例外是，在红山岩（Red Hill Syenite）正长岩中同时发现了似长石和含石英岩石。 wikipedia.org
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Leucite
Leucite (from the Greek word leukos meaning white) is a rock-forming mineral of the feldspathoid group, silica-undersaturated and composed of potassium References Feldspathoid Potassium minerals Aluminium minerals Tetragonal minerals Minerals in space group 88 wikipedia.org
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Nosean
Nosean, also known as noselite, is a mineral of the feldspathoid group with formula: Na8Al6Si6O24(SO4). H2O. References Webmineral data Mindat with location data Feldspathoid Sodalite group Sodium minerals Aluminium minerals Sulfate minerals Cubic minerals wikipedia.org
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Essexite
Essexite grades into a nepheline monzogabbro with a decrease in potassium feldspar and an increase in the feldspathoid minerals. The presence of nepheline, a feldspathoid mineral, indicates that essexites are silica undersaturated. wikipedia.org
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Tonalite
Quartz (SiO2) is present as more than 20% of the total quartz-alkali feldspar-plagioclase-feldspathoid (QAPF) content of the rock. wikipedia.org
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Monzonite
Such rocks are classified by their relative percentages of quartz, plagioclase, alkali feldspar, and feldspathoid (the QAPF classification). the QAPF fraction, the rock is termed a quartz monzonite, while if feldspathoids are present as up to 10% of the QAPF fraction, the rock is termed a feldspathoid-bearing wikipedia.org
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