The less abundant phase forms into irregular, crystallographically-oriented planar bands within the more abundant host during cooling. The exsolution lamellae of Na- and K-rich feldspar are created in the bulk composition of the K-feldspar. …
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Antiperthite unmixing in plagioclase (note that the anthiperthite have within them perthite unmixing) in a Charnokite, Rogaland Province, Norway. XPL image. 10x (Field of view = 2mm) Plagioclase, pyroxene and interstitial orthoclase in a monzodiorite. XPL image, 2x (Field of …
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An antiperthite is an intergrowth arising due to exsolution where potassic feldspar is present as blebs or lamellae within a sodic feldspar. The term mesoperthite is used when sodic and potassic feldspars are in broadly equal anbundance. Perthite that can only be observed with the aid of a microscope is known as microperthite.
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Antiperthite is an intergrowth where K-feldspar lamellae exsolve in sodium plagioclase like albite or Ca-bearing plagioclase. The host or dominant phase in antiperthite is sodium plagioclase. Therefore, the homogenous …
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An antiperthite is an intergrowth arising due to exsolution where potassic feldspar is present as blebs or lamellae within a sodic feldspar. The term mesoperthite is used when sodic and potassic feldspars are in broadly equal anbundance.
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0542d82e-9f95-47cd-b88b-942b32f95ebf (as Antiperthita) e29b4046-36df-4072-9c16-181ac2e33a3e (as Antiperthite) 7f5e269c-9a6b-42ca-b2db-924a3772bd4e (as Feldspar Group)
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Exsolution. Intergrowths develop within single crystals by a process that is variously called phase separation, unmixing and exsolution. In alkali feldspars the intergrowths are called perthite (after the type locality near Perth, Ontario), mesoperthite and antiperthite (Fig. 4), depending on the bulk composition of the intergrowth.The Na-rich and K-rich parts of perthitic intergrowths should ...
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{"payload":{"allShortcutsEnabled":false,"fileTree":{"124":{"items":[{"name":"1 dampak palu crusher okd 1156.md","path":"124/1 dampak palu crusher okd 1156.md ...
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According to this idea of Kohler, the phenomenon described by ROBERTSON (1959) and mentioned in the foregoing paragraph could better be called antiperthite, if only because the plagioclase or albite phase is more important than the alkali-feldspar phase.
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the formation of antiperthite is applicable to these rocks. A model basecl on nucleation is suggested for the antiperthitic ptagioclase in potash-deficient gneiss.
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An Antiperthite is an intergrowth an intergrowth of orthoclase (often as lamellae) enclosed in a plagioclase host. Many minerals that show complete solid solution at higher temperatures do not show such solid solution at lower temperatures. When this is the case, the phenomenon of exsolution occurs. Since solid solutions are really one mineral ...
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test the exsolution hypothesis for the origin of antiperthite. If the origin of antiperthite is due to exsolution and if these rocks formed under simi-lar conditions, plagioclase from the granite gneiss should be antiperthitic because the amount of potash feldspar in solid solution would represent
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Perthite and antiperthite. The solid-solution of Na, Ca, and K in high-temperature alkali feldspars (orthoclase and anorthoclase) and the subsequent exsolution of Na and Ca to form perthite in which the plagioclase lamellae are evenly distributed throughout the K-feldspar in diverse patterns but with similar shapes are common characteristics of
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while Antiperthite is lamellae of K-spar in an albite host (see fig 15-15, top). When quartz is involved the relationships are more complicated and not well understood. Myrmekite is a quartz-plagioclase intergrowth relatively common in acid and intermediate rocks (fig 15-15 middle). Quartz is commonly found as stringers or vermicules
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A Na-rich host with K-rich lamellae is an antiperthite. Editors: Maria Rowley (00), Sharon Mason (05), Danielle Schmandt (07) Thin section in crossed polarized light of microcline with albite intergrowth. The microcline has tartan twinning, while the albite is the globular gray areas. This was probably a solid solution that cooled; the two ...
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Antiperthite. Antiperthite is an intergrowth where K-feldspar lamellae exsolve in sodium plagioclase like albite or Ca-bearing plagioclase. The host or dominant phase in antiperthite is sodium plagioclase. Therefore, the …
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An intergrowth of orthoclase (often as lamellae) enclosed in a plagioclase host. Result of an exsolution process (cf. also perthite). No information on health risks for this material has been …
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