Copy of LAB 2 PPT - Optical Mineralogy

Copy of LAB 2 PPT - Optical Mineralogy - Optical Mineralogy...

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Unformatted text preview: Optical Mineralogy Optical Polarized – NS, EW Plane Light – NS Cross Polar – EW (analyzer in) http://www.eos.ubc.ca/courses/eosc221/frames2/micro/index.html Optical Mineralogy Optical Relief Extinction Isotropic vs Anisotropic Birefringence Pleochroism Undulose vs Straight Extinction Twinning ­ cross hatch, albite Relief RELIEF ­ the degree to which a mineral grain or grains appear to stand out from the mounting material, whether it is an immersion oil, Canada balsam or another mineral. http://www.brocku.ca/earthsciences/people/gfinn/optical/relief.htm Relief Relief Stong – Medium ­ Low http://www.brocku.ca/earthsciences/people/gfinn/optical/relief.htm Extinction Extinction DSCN2160proc.mov Isotropic vs Anisotropic Isotropic ­Flourite http://www.brocku.ca/earthsciences/people/gfinn/optical/wavefron.htm ­Garnet ­Halite Isotropic Isotropic Plane Polar Cross Polar http://www.brocku.ca/earthsciences/people/gfinn/optical/wavefron.htm Isotropic Isotropic Plane Polar Cross Polar http://www.eos.ubc.ca/courses/eosc221/labs/lab1.html Birefringence Birefringence Refraction of fast and slow rays results in interference colors http://www.brocku.ca/earthsciences/people/gfinn/minerals/ol2.jpg Birefringence Birefringence Pleochromism Pleochromism Change in color upon rotating the stage Biotite http://www.gly.bris.ac.uk/www/teach/opmin/mins.html#morph Twinning Twinning Framework Grains Framework Quartz Feldspar Lithics – sedimentary, volcanic, metamorphic Opaque Grains – oxides Distinct Grains – muscovite, glauconite Quartz Quartz http://www.brocku.ca/earthsciences/people/gfinn/minerals/quartz2.jpg Chert Chert http://plaza.snu.ac.kr/%7Elee2602/atlas/RF.html Feldspar Feldspar Plagioclase K Feldspar http://www.geolab.unc.edu/Petunia/IgMetAtlas/minerals/microcline.X.html Framework Grains Framework Quartz Feldspar Lithics – sedimentary, volcanic, metamorphic (http://plaza.snu.ac.kr/ %7Elee2602/atlas/atlas.html) Opaque Grains – oxides Distinct Grains – muscouvite, glauconite Volcanic Volcanic Basalt Rhyolite Volcanic Shards http://www.geolab.unc.edu/Petunia/IgMetAtlas/volcanic­micro/rhyolite.X.html Phyllite Metamorphic Metamorphic Quartzite Slate Granoblastic http://www.geolab.unc.edu/Petunia/IgMetAtlas/meta­micro/metamicro.html Muscovite Muscovite http://www.brocku.ca/earthsciences/people/gfinn/minerals/musc.htm Glaucophane Glaucophane Plane Polar Cross Polar http://www.geolab.unc.edu/Petunia/IgMetAtlas/minerals/minerals.html Calcite Calcite Plane Polar Cross Polar http://www.geolab.unc.edu/Petunia/IgMetAtlas/minerals/calcite.UX.html Optical Mineralogy Optical Matrix – blurry Cement – precipitated between and sometimes over grains ...
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This note was uploaded on 04/09/2011 for the course GEO 416M taught by Professor Staff during the Spring '08 term at University of Texas at Austin.

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