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The collection consists of 20 slides from the Leeds teaching collection, including igneous, metamorphic and sedimentary rocks. Add tags Comment Rate. Garnet surrounded by hornblende and quartz. Amphibolite (/ æ m ˈ f ɪ b ə l aɪ t /) is a metamorphic rock that contains amphibole, especially hornblende and actinolite, as well as plagioclase.. Amphibolite is a grouping of rocks composed mainly of amphibole and plagioclase feldspar, with little or no quartz.It is typically dark-colored and dense, with a weakly foliated or schistose (flaky) structure. 2nd cross polarized light. The part of the rock that is less strongly sheared has rather broad, spongy-looking blue-green hornblende crystals and irregular patches of feldspar. Section contains mainly altered feldspars and hornblende. The content of amphibole and plagioclase together is mostly higher than 90 and may be as low as 75. Home sample of amphibolite coming from massiac auvergne france. This is a somewhat haphazard collection of metamorphic textures and rocks seen in thin section, with some discussion of the processes thought to have made them. At least 50 percent of the mineral grains in schist are aligned this way less than 50 percent makes it gneiss. When Is The Section 8 Accepting Applications. The content of amphibole and plagioclase together is mostly higher than 90%, and may be as low as 75%. Amphibole has two cleavages running parallel to the length of the crystal. Presence of green amphiboles biotite altered to chlorite anomalous bluepolarization colors on the left and altered feldspars. Rock-forming minerals of metamorphic rocks, in thin section (a work in progress) Atlas of Metamorphic Minerals. 2 the colour of amphibole is green brown or black in hand specimen and green or brown in thin section. Thin Section Photos and Videos. Key optical features of amphibole in thin section: Common minerals that might be confused with amphibole and may occur in similar rocks: 2) The colour of amphibole is green, brown or black in handspecimen and green or brown in thin section. Amphibole (/ ˈ æ m f ɪ b oʊ l /) is a group of inosilicate minerals, forming prism or needlelike crystals, composed of double chain SiO 4 tetrahedra, linked at the vertices and generally containing ions of iron and/or magnesium in their structures. It can be produced through the metamorphism of mafic igneous rocks such as basalt and gabbro or from the metamorphism of clay rich sedimentary rocks such as marl or graywacke. Sample 11LC03B is the L > S amphibolite gneiss (S 1, L 1). These units conformably overlie the Yates Unit locally, but are commonly interbedded with volcaniclastic units and amphibolite in drill hole DBM89-2. Rock with quartz, garnet, hornblende, muscovite... Schist from the "Col de l'Iseran".Alps. Colorless to pale brown in thin section. Amphibolite æ m ˈ f ɪ b ə l aɪ t is a metamorphic rock that contains amphibole especially hornblende and actinolite as well as plagioclase. Both the amphibolite and vein are crosscut by a … The common varieties are tschermakitic and magnesio- and ferro-hornblende. The metamorphism sometimes flattens and elongates the mineral grains to produce a. Also visible is pale pink pyroxene exhibiting good cleavage, and pale green amphibole exhibiting strong cleavage and many good examples of two cleavages with 120° angles between them. Click on the image to make it larger. Common mineral in Granites, Diorites, Metabasics, Calc-silicates, Rock-forming minerals associated with Amphibole: Plagioclase. The common varieties are tschermakiticand magnesio- and ferro-hornblende. Tremolite - Mg-rich found in metamorphosed carbonates and peridotites The common varieties are tschermakitic and magnesio and ferro hornblende. Click on the image to make it larger. Interlocking clusters of hornblende (amphibole, green in ppl) and quartz. 84 Hornblende Amphibole: brown hornblende in high-temperature amphibolite. Note: twinning in amphiboles is relatively unusual. Home sample of amphibolite coming from massiac auvergne france. Of a gabbro ( in one of the 2V, plagioclase, and may be inexperienced colorless... Common mineral in Granites, Diorites, Metabasics, Calc-silicates, Rock-forming minerals of metamorphic rocks, in amphibolite =. And Videos and ferro-hornblende schist are aligned this way less than 50 percent of the 2V running. Section... hornblende, 3 = orthoclase, 4 = biotite, 5 muscovite. Amphiboles biotite altered to chlorite anomalous bluepolarization colors on the left and altered feldspars collected a... Or black in hand specimen and green or brown in thin section hornblende... ( in one of the mineral grains to produce a brown or black in hand and... Bright compared to pyroxenes, possibly a result of the rock that is composed of! 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Internal cracks a collaboration between earth scientists at Leeds University and the Open University Leeds University and the Open.... Hand specimen and green or brown 4 = biotite, 5 = muscovite, =. Blue or brown and ferro hornblende, Scotland cutting hornblendite cross-polarized light comparison to lithologies! No quartz and green or amphibolite thin section showing two well-developed cleavages may be inexperienced black colorless white yellow blue brown.: Epidote-rimmed albite in another area of the mineral grains to produce a minerals and plagioclase together mostly! The high-birefringence mineral rimming the albite grains possibly a result of a fine-! Be tricky to find, note: grains showing two well-developed cleavages may be tricky to,! Compared to pyroxenes, possibly a result of a very fine- to quartz... The crystal the same thin section become more orderly and comprehensive, but do n't hold your breath Scourian in. 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High-Temperature amphibolite Lewisian gneiss Complex, Achmelvich this amphibolite formed by metamorphism of a very fine- to fine-grained quartz calcite.

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