photos of thin section 60025,21. Field of view is 2.5 mm. S79-27300 and 301. Olivine: Warren and Wasson (1977), Ryder (1982) and James et al. (1991) find that olivine in various portions of 60025 has a range of compositions (Fo 42-66). Pyroxene: Pyroxene is present as subhedral to anhedral grains included in plagioclase, as anhedral grains at

Anorthosite; Norite, feldspathic pyroxenites; Harzburgite, Dunite (ultramafic in thin section; It may occur as independent prisms or as crusts on the pyroxene. 14.

This is a thin section of Gabbro from the tertiary volcanic centre in Ardnamurchan, on the West Coast of Scotland. Famous for its complete ring dyke made of Eucrite, a similar gabbro. This sample was collected from a Part of the Hypersthene gabbro at Sanna Point. Jan 19, 2017 - Photomicrograph of a thin section showing twinned, aligned plagioclase in anorthosite. A coarse grained igneous rock, anorthosite is characterized by being … The anorthosite-mangerite-charnockite-granite (AMCG) suite of rocks in North America is typically regarded as an association of two rock suites that are coeval but not comagmatic (Emslie et al., 1994; McLelland et al., 1994; Bickford et al., in press).The anorthosite suite is regarded as consisting of comagmatic anorthosite, leucogabbro, and gabbro, plus OGN and OAGN, while the mangerite suite anorthositic material. While cooling to form a solid body, parts of the interior melted again to form lava flows on the front side.

Shortly after material gathered together to form the Moon, the outer Moon melted. Inequigranular anorthosite. 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. The thin section consists almost entirely of plagioclase feldspar with minor pyroxene.

Anorthosite is an almost monomineralic, feldspathic rock with a great variety of industrial applications (Table 1). Anorthosite massifs are known to host important ore depos-its such as ilmenite and are, in many cases, excellent sources for high-quality rock aggregate and also for dimension-stone. The exploitation of anorthosite for industrial

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).

Anortosit, anorthosit eller ibland labradorsten, är en magmatisk, intrusiv djupbergart, som till mer än 90 % är uppbyggd av fältspat ().Också pyroxen samt mindre mängder av oxider som magnetit, ilmenit och olivin förekommer.

In the 23 m thick layer –13, seven samples were analysed. The results are shown in Fig. 9. Anorthosite. Calciclasite ⓘ Labradoritite ⓘ Anorthitite ⓘ Foid-bearing-anorthosite ⓘ Troctolitic anorthosite ⓘ Charnockitic anorthosite; Foid-syenitoid. Foid-monzosyenite. Nepheline-monzosyenite ⓘ Allochetite; Leucite-monzosyenite ⓘ Sommaite; Foid-gabbroid.

The microscopic examination of thin-sections in the petrographic analysis also provides important grain size, textural Quartz monzogabbro. Quartz anorthosite. The former rocks of this study are located in the southern part of TIB, in the late Olle Wallner, who without complaints prepared an endless row of thin sections. model for the origin of the gabbro-anorthosite-syenite-potassic granite suite.
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Composed of calcic plagioclase with less than 10% ferro-magnesium minerals - plagioclase may be labradorite, bytownite, or anorthite. The name is from anorthose, an old name for triclinic feldspars.

Greenish olivine and black hornblende are absent, and the hardness of 5.5 also ruled out these minerals as well as the feldspars.
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To the left the Nodular Troctolite consists of olivine oikocrysts 20–30 cm long (pale) set in a matrix of anorthosite Many anorthosite outcrops are transected by thin veins and stringers of quartz and feldspar, manifesting incipient disaggregation by the granitic protolith to the host quartzofeldspathic gneiss. This advances to the situation where clusters of individual plagioclase megacrysts, some with adhering mafic intercumulus, are strewn throughout the enclosing quartzofeldspathic gneiss (e.g., Fig. 18.8A ).

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Anorthosite. Calciclasite ⓘ Labradoritite ⓘ Anorthitite ⓘ Foid-bearing-anorthosite ⓘ Troctolitic anorthosite ⓘ Charnockitic anorthosite; Foid-syenitoid. Foid-monzosyenite. Nepheline-monzosyenite ⓘ Allochetite; Leucite-monzosyenite ⓘ Sommaite; Foid-gabbroid. Foid-gabbro. Analcime-gabbro ⓘ Glenmuirite ⓘ Teschenite; Nepheline-gabbro ⓘ Theralite

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, with hornblende and ortho pyroxenes.