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Nepheline-monzosyenite ⓘ Allochetite; Leucite-monzosyenite ⓘ Sommaite; Foid-gabbroid. Foid-gabbro. Analcime-gabbro ⓘ Glenmuirite ⓘ Teschenite; Nepheline-gabbro ⓘ Theralite anorthite. In the IUGS classification, anorthosite contains 0-5% Q, P/(A + P) >90, and M < 10 (M = Mafics). The name is from anorthose, an old name for triclinic feldspars.

Anorthosite thin section

Vivid colors (yellow, pink, blue, even green) of the upper first order and the lower second order are due to the larger-than-usual thickness of the section, but also suggest the presence of anorthite. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Anorthite. Anorthite is the calcic end member of the plagioclase feldspar series. In thin section, plagioclase feldspar grains often look like they’re sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the plagioclase feldspar page.

Parts of large plagioclase crystals fill the view (crossed polarized light -XPL-), even at a low magnification (40x). Vivid colors (yellow, pink, blue, even green) of the upper first order and the lower second order are due to the larger-than-usual thickness of the section, but also suggest the presence of anorthite.

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a = 8.1768 b = 12.8768 c = 14.1690 ® = 93:17± ¯ = 115:85 ±° = 92:22 Z = 8 X-ray Powder Pattern: Monte Somma, Italy (low). In optical mineralogy and petrography, a thin section is a laboratory preparation of a rock, mineral, soil, pottery, bones, or even metal sample for use with a polarizing petrographic microscope, electron microscope and electron microprobe. A thin sliver of rock is cut from the sample with a diamond saw and ground optically flat.

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Se hela listan på en.wikipedia.org Most anorthosite layers are thin (less than 3 m) and only one analysis of plagioclase was obtained for the entire layer.

• It contain plagioclase of An35-65 range. 14. ORIGIN of anorthosite Magmatic Origin: Massif anorthosite are magmatic and layered anorthosites are magmatic differentiation. • It has been derived from a basic magma either grabbroic or dioritic in compsition. 2013-10-27 · 2 thoughts on “ Anorthosite from Parc Roghadal, Isle of Harris (UK Grid Ref: NG 05571 84902) ” Michael Yeaman May 16, 2016 at 2:17 am. Marvelous, I was there last week collecting a few pegmatite specimens and I am glad it is still there in one )large) piece!
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Layering is predominantly rhythmic type with alternating thin plagioclase-rich and hornblende rich layers. Layering involving different members of the complex i.e. anorthosite, gabbroic anorthosites, anorthositic gabbro, gabbros and ultramafic rock, is observed only at a few places of limited extent. English: Anorthosite, with skeletal crystal of magnetite, cross polarized light. From the Bushveld Igneous Complex. Date: 27 June 2005: Source: at least one section of the anorthosite massif, Concordant gabbro dike showing sharp contacts with anorthosite In thin section the mineral is pale green.

Quaternary cover in excavations in the southern part of the Laxemar subarea. Furthermore Polished thin sections of rock samples were made by Minoprep AB, considered part of an economic system with Earth, routine and safe transportation within the. Earth-Moon Pieters et al (2001) used Clementine UVVIS data to distinguish between anorthosite, using thin film technologies (Tuttle et al. 2000) In the previous section it was emphasized that the mechanical model should not be assumed, but should be soft mineral in a joint, it is often useful to try to press a thin knife into the joint. It is Berget utgörs av en anorthosite, som består till av S Buntin · Citerat av 8 — lines total altogether (i.e., lines 1, 6, C and B) a 1330-km seismic section of Partial melting of the upper mantle is evident from mafic dykes, gabbro, and anorthosite, as and significance of spectacular layering features developed in the thin,.
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2. ANORTHOSITE white course grained plagioclase MT. 3. APALITE fine pink CO. 4. BASALT olivine, La Bajada Hill NM Quarternary. 5. BASALT scoriaceous NM recent flow. 6.

Anorthosite: Anorthosite: A leucocratic coarse-grained plutonic rock consisting essentially of plagioclase (usually labradorite or bytownite) often with small amounts of pyroxene.
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Optical Class: Biaxial ({). Dispersion: r < v; weak. ® = 1.573{1.577 ¯ = 1.580{1.585 ° = 1.585{1.590 2V(meas.) = 78±{83± Cell Data: Space Group: P1 (low). a = 8.1768 b = 12.8768 c = 14.1690 ® = 93:17± ¯ = 115:85 ±° = 92:22 Z = 8 X-ray Powder Pattern: Monte Somma, Italy (low). Se hela listan på en.wikipedia.org Most anorthosite layers are thin (less than 3 m) and only one analysis of plagioclase was obtained for the entire layer. However, to determine possible internal variation, two thick layers were studied in detail. In the 23 m thick layer –13, seven samples were analysed.

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Ths rock has a continuum of grain sizes, from very small to quite large. It does not have a phenocrystic texture, having larger crystals set in a much finer-grained matrix. The rock type is anorthosite, a cumulate rock made mostly of plagioclase. Cumulate rocks typically have the same minerals about the same size. Anorthosite: Anorthosite: A leucocratic coarse-grained plutonic rock consisting essentially of plagioclase (usually labradorite or bytownite) often with small amounts of pyroxene. Olivine, amphibole, ilmenite, magnetite, and spinel are also sometimes present.

A rock thin section is created by gluing a small piece of rock onto a glass slide, then grinding it down to a thickness of 30 microns (the average human hair is about 100 microns in diameter) so that light shines through it when examined under the microscope. these clasts, an apparent ferroan troctolitic anorthosite, based upon our examination of thin section MAC88105,97 and our bulk chemical analysis of five separate fragments from MAC88 105,5 1 by INAA. This clast, designated W2 by the JSC curatorial facility, was originally about 1 cm Jan 19, 2017 - Photomicrograph of a thin section showing twinned, aligned plagioclase in anorthosite. A coarse grained igneous rock, anorthosite is characterized by being almost completely composed of plagioclase. Massif anorthosite • Layring is not found in massif anorthosite.