astrophyllite वाक्य
उदाहरण वाक्य
मोबाइल
- It is associated with microcline and astrophyllite at Pikes Peak, Colorado.
- Astrophyllite is of interest primarily to scientists and collectors.
- Astrophyllite is usually opaque to translucent, but may be transparent in thin specimens.
- Several localities contain the rare amphibole riebeckite and the even more rare mineral astrophyllite.
- Owing to its limited availability and high cost, astrophyllite is seldom seen in an ornamental capacity.
- It was discovered in 1972 in the Korgeredabinsh massif, Tuva, Russia and is named for its zirconium content and its relationship to astrophyllite.
- Found in cavities and fissures in unusual felsic igneous rocks, astrophyllite is associated with feldspar, mica, titanite, zircon, nepheline, and aegirine.
- This newly discovered mineral belongs to the astrophyllite group of minerals and contains structures that are composed of titanosilicate layers ( Krivovichev et al ., 2004 ).
- "' Astrophyllite "'is a very rare, brown to golden-yellow isomorphous series with kupletskite, to which it is visually identical and often intimately associated.
- Serandite has been found in association with aegirine, analcime, arfvedsonite, astrophyllite, eudialyte, fluorite, leucophanite, mangan-neptunite, microcline, nepheline, sodalite, and villiaumite.
- It is this crystal habit that gives astrophyllite its name, from the Greek words " astron " meaning " star " and " phyllon " meaning " leaf ".
- It occurs in nepheline syenites and pegmatites in association with aegirine, nepheline, microcline, arfvedsonite, elpidite, loparite, eudialyte, astrophyllite, mangan-neptunite, lavenite, rinkite, apatite, titanite and ilmenite.
- Astrophyllite is found in a few scarce, remote localities : Mont-Saint-Hilaire, Quebec, Canada; Pikes Peak, Colorado, US; Narsarsuk and Kangerdluarsuk, Greenland; Brevig, Norway; and the Kola Peninsula, Russia.
- At the same locality it was found in alkaline pegmatite veins associated with clinobarylite, natrolite, aegirine, microcline, catapleiite, fluorapatite, titanite, fluorite, galena, sphalerite, annite, astrophyllite, lorenzenite, labuntsovite-Mn, kuzmenkoite-Mn, cerite-( Ce ), edingtonite, ilmenite and calcite.
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