1.2.2 Previous work on the anorthosites of the Kunene Intrusive Complex. 29 Thin section microphotographs of the (a-c) white anorthosite suite and (d) dark

General view of an anorthosite from Minnesota in thin section. 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.

Chondrite L4. Tagounite 001, Morocco 1999 sample 2. Polished section. Chondrite H5 Sahara 97095. Thin section.

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 is often associated with gabbro.

GRD02YCS0, Microcline, Microcline var.

This is a thin section of one of a series of specimens very kindly sent to me from USA. Many thanks to the donor! This has come from an area dominated geologically by a large pre-cambrian anorthosite intrusion. Rounded-granular plagioclase and quartz with areas of intergrowth, with pink embayed garnet.

Lunar Basalt 12002, Apollo 12. Lunar Basalt 12005, Apollo 12.

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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.

As part of our studies on warm asphalt mixture production at about 100 °C using foamed bitumen Åldringsgraden hos de gamla bindemedlen; flera bindemedel åldrades i en Thin Film Oven. • Bitumenkälla och Anorthosite, NO. Sparagmitt in Dünnschliffen [On the behavior of canada balsam in thin sections]. from anorthosite from Bönskär in the northern part of the Stockholm archipelago and its 309-312Chapter in book (Other academic) The Plat Sjambok Anorthosite and its tonalitic country rocks: mesoproterozoic pre-tectonic intrusions in the Kaaien Proterzoic: Sedex och BIF, anorthosite-hosted Ti avsättningar You look at a thin section that consists almost entirely of secondary K-feldspar and biotite? Tunn sektion av kvartsit. Granat glimmer schist. Is. Gabbro från Rum, Skottland.
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You can find the explanation on the plagioclase feldspar page. Anorthite weathers quite readily, so it’s not terribly abundant on Earth. Unfortunately, these thin sections are thicker than the usual 30 micrometers, and in crossed polarizers (XPL) the plagioclase has colors of the upper first order, instead of the usual grey. The QAPF diagram ( see on this page ) shows that anorthosite has more than 90% plagioclase (P) compared to K-feldspar (or alkali feldspar, A), less than 5% quartz (Q) and less 5% feldspathoids (F).

Bastard Reef. Magnetite is found in the majority of thin sections 16 - Mineralienatlas (Deutsch) 17 - Online Mineral Museum 18 - QUT Mineral Atlas 19 - Ruff.Info 20 - UCLA - Petrography Thin-Sections 21 - WWW- MINCRYST.
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the Prioniodus elegnns Zone, which corresponds to the upper part of the Af. Impersistent thin concordent bands of amphibolite are associated with the above anorthosite zone abut against the sea, and thus the top of the complex is hidden

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. It is then mounted on a glass slide and then ground smooth using progressively finer abrasive grit until the sample is only 30 μm thick. The method uses the Michel The locality contained ultramafics.

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The age of this rock is 4440 million years. Olivine - Trace olivine Fo 65-67 is found with low-Ca pyroxene in “mafic clumps.” Anorthosite This white rock is composed almost entirely of crystals of one mineral, feldspar. Rocks like this make up much of the Highlands of the Moon, where feldspar produces the light color. Shortly after material gathered together to form the Moon, the outer Moon melted. Inequigranular anorthosite.

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. It is then mounted on a glass slide and then ground smooth using progressively finer abrasive grit until the sample is only 30 μm thick. The method uses the Michel

• 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! Anorthosite plutons occur in a wide range of sizes. Some smaller plutons, exemplified by many anorthosite bodies in the U.S. and Harris in Scotland, cover only a few dozen square kilometres. Larger plutons, like the Mt. Lister Anorthosite, in northern Labrador, Canada, cover several thousands of square kilometres. Se hela listan på geology.fandom.com 2013-04-23 · RM: Anorthosite is calcium feldspar, which is basically sand containing aluminum, calcium, low levels of soda and 1% iron.

Cosmochim. Acta 46, 1591-1601. Ryder G. (1990) Lunar samples, lunar accretion and the early bombardment of the Moon.