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     • l'angle d'extinction est de 0° dans le cas des orthopyroxènes, différent de 0° dans les cas des clinopyroxènes présence éventuelle de macles simples ou en sablier présence éventuelle d'ex-solutions "en arête de poisson".
     minweb.univ-lille.fr › res › cours

     Groupe des pyroxènes [Minéralogie] - univ-lille.fr

2. www.science.smith.edu › orthopyroxene › opxOrthopyroxene Page - Clark Science Center

   www.science.smith.edu › orthopyroxene › opx

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   Extinction: Parallel in longitudinal sections and symmetrical in basal sections. Dispersion: r > v: 2V is larger in red light than violet light. Distinguishing Features: Low birefringence, first order colors. Parallel extinction in longitudinal sections, pale pink to green pleochroism. Approximatly 90º cleavage planes.

3. People also ask

   Does orthopyroxene have a straight extinction?

   • Orthopyroxene exhibits first order birefringence (grey-yellow), cleavage present, orthorhombic = straight/symmetrical extinction. This sequence of 3 photomicrographs demonstrates the straight extinction of Orthopyroxene (cleavage is aligned vertically or N-S in the first photomicrograph taken in plane polarized light).

   Orthopyroxene - University of Notre Dame

   www3.nd.edu/~asimonet/CE30540/SP2018/IGNEOUS PETROLOGY LABS/Minerals/Orthopyroxene.html

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   What is a cleavage of orthopyroxene?

   • · Appearance, cleavage , extinction -Well developed end sections may appear as blocky four- or eight-sided crystals; more typically orthopyroxene forms stubby prisms, rectangular lathes, or anhedral crystals and masses. Basal sections show cleavage angle near 90 o. Longitudinal sections show one cleavage .

   Orthopyroxene - University of North Dakota

   sites.und.edu/dexter.perkins/opticalmin/opx.htm

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   Which photomicrograph shows symmetrical extinction of orthopyroxene?

   • The second and third photomicrographs are under cross polarized light. The third photomicrograph is rotated slightly to show the low first order birefringence charactersitic of Orthopyroxene. This sequence of 3 photomicrographs shows symmetrical extinction of Orthopyroxene and also the low first order birefringence.

   Orthopyroxene - University of Notre Dame

   www3.nd.edu/~asimonet/CE30540/SP2018/IGNEOUS PETROLOGY LABS/Minerals/Orthopyroxene.html

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   What is orthopyroxene found in?

   • Approximatly 90º cleavage planes. Thin irregular and wavy lamellae common. Orthopyroxene high in Mg is common in gabbro and peridotite groups. Fe-rich orthopyroxene is typically found in diorite, syenite and granite. With Ca-clinopyroxene, plagioclase and olivine in mafic and ultramafic igneous rocks.

   Orthopyroxene Page - Clark Science Center

   www.science.smith.edu/geosciences/petrology/petrography/orthopyroxene/opx.html

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4. individual.utoronto.ca › Orthopyroxene-ClinopyroxeneOrthopyroxene and Clinopyroxene - University of Toronto

   individual.utoronto.ca › Orthopyroxene-Clinopyroxene

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   Extinction angle can also be used to differentiate between the two pyroxenes, as orthopyroxenes have parallel extinction and clinopyroxenes have inclined extinction, though this is not well illustrated in the images here.

5. www3.nd.edu › ~asimonet › CE30540Orthopyroxene - University of Notre Dame

   www3.nd.edu › ~asimonet › CE30540

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   This sequence of 3 photomicrographs shows symmetrical extinction of Orthopyroxene and also the low first order birefringence. The first photomicrograph is taken under plane polarized light and the last two are under cross polarized light.

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6. Videos

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     Orthopyroxene tutorial Optical mineralogy

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     Orthopyroxene under cross polarized light.

     Jan 19, 2020

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     2:03

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     Optical Mineralogy Orthopyroxene Tutorial

     Aug 2, 2021

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7. www.alexstrekeisen.it › english › vulcALEX STREKEISEN-Orthopyroxene-

   www.alexstrekeisen.it › english › vulc

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   Optical properties: • Colour and Pleochroism: Colourless. • Form: crystals form stubby prisms elongate along the c-axis, basal sections are 4 or 8 sided and show two cleavages at 90°. • Cleavage: typical pyroxene cleavages parallel to {110}, which intersect at ~90°.

8. sites.und.edu › dexter › opticalminOrthopyroxene - University of North Dakota

   sites.und.edu › dexter › opticalmin

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   ·Appearance, cleavage, extinction-Well developed end sections may appear as blocky four- or eight-sided crystals; more typically orthopyroxene forms stubby prisms, rectangular lathes, or anhedral crystals and masses. Basal sections show cleavage angle near 90 o. Longitudinal sections show one cleavage.

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9. www.cairn-sciences.info › atlas-de-petrologieFiche 22. Les pyroxènes (1) : orthopyroxènes et clinopyroxènes

   www.cairn-sciences.info › atlas-de-petrologie

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   Les clinopyroxènes peuvent être :calco-ferromagnésiens (Ca(Fe,Mg))2 Si2O6 ; les principaux sont le diopside (calco-magnésien) et les augites souvent moins magnésiennes, parfois titanifères ; leur composition, ainsi que celle des orthopyroxènes, peut être reportée dans le triangle Mg – Fe – Ca (document 1) ;sodiques avec notamment l ...

10. minweb.univ-lille.fr › res › coursGroupe des pyroxènes [Minéralogie] - univ-lille.fr

    minweb.univ-lille.fr › res › cours

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    l'angle d'extinction est de 0° dans le cas des orthopyroxènes, différent de 0° dans les cas des clinopyroxènes. présence éventuelle de macles simples ou en sablier. présence éventuelle d'ex-solutions "en arête de poisson". Orthopyroxène en lmumière polarisée.