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     • l'angle d'extinction est de 0° dans le cas des orthopyroxènes, différent de 0° dans les cas des clinopyroxènes
     minweb.univ-lille.fr › res › cours

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

2. 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.

   • Orthopyroxene

     The grain at the centre of the left margin shows that...

   • Augite

     Interference colours range to upper second order (B and D)....

   • Table of Contents

     TABLE OF CONTENTS: Some Fundamental Properties of Minerals...

   • Tourmaline

     Tourmaline in D exhibits blue absorption colours which can...

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 the chemical composition of orthopyroxene?

   • Orthopyroxene Chemical Comp .. Orthopyroxene is usually a mixture (solid solution) of Enstatite and Hypersthene. Orthopyroxene exhibits first order birefringence (grey-yellow), cleavage present, orthorhombic = straight/symmetrical extinction.

   Orthopyroxene - University of Notre Dame

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

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4. 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°.

5. 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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6. Videos

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     Orthopyroxene tutorial Optical mineralogy

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     bilibili.com

     Optical Mineralogy Orthopyroxene Tutorial

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     16:02

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     2: loxodromie et orthodromie, caps et distances, optimiser sa route, cartographie

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7. 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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8. 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.

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. geologyistheway.com › minerals › pyroxene-groupPyroxene – Geology is the Way

    geologyistheway.com › minerals › pyroxene-group

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    Orthopyroxenes and clinopyroxenes can be identified based on the angle of extinction of prismatic section at CPL: orthopyroxenes show straight extinction, whereas clinopyroxenes show oblique extinction at variable angle.