17 - Isometric =isotropic minerals Garnet Gold Copper...

Info icon This preview shows pages 1–21. Sign up to view the full content.

12/2/10 Isometric =isotropic minerals: Garnet Gold Copper Magnetite Pyrite
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10 Fluorite Spinel Chromite Halite
Image of page 2
12/2/10
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10
Image of page 4
12/2/10 Glass is isotropic Glass is isotropic PPL XPL
Image of page 5

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10
Image of page 6
12/2/10
Image of page 7

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10
Image of page 8
12/2/10 Crystal system
Image of page 9

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10 FIG. 4.1
Image of page 10
12/2/10 - vibration directions of light rays emerging from mineral ° remain parallel to that of lower polaroid (E- W) - when analyzer in 1 light ° completely absorbed ° continuous extinction
Image of page 11

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10 OPTICAL PROPERTIES OF ISOTROPIC MINERALS Color: important to distinguish various species of isotropic mineral Fluorite: pale to dark purple, green, blue Spinel : dark green Garnet : yellow, green, pink, red Chromite : dark brown Relief Halite: low; Fluorite: moderate; Garnet: very high Refractive Index Fluorite < Canada Balsam (mounting medium) Garnet >> Canada Balsam (oil) Cleavage Halite: cubic; Fluorite : 3 directions Fracture Garnet ° distinct fracture
Image of page 12
12/2/10 =t (°n1-n2i ) Interference color = thickness * difference in refractive index retardation birefringence T h I c k n e s s 1 birefringen ce
Image of page 13

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10 Anomalous 5 and Anomalous Extinction anomalous ° ° navy-blue to black anomalous interference colours due to distortions of crystal structure or compositional substitutions Compositional zoning by most isotropic minerals Inclusions Important in garnet° seive texture Alteration Garnet 1 commonly to chlorite along fractures and along edges seiv e
Image of page 14
12/2/10 Garnet in plane polarized light (ppl)
Image of page 15

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10 (FeCaMnMg)3Al2(SiO4)3 (Fe, Mg, Al)6(Si, Al)4O10(OH)8 Garnet chlorite Garne t chlorit e
Image of page 16
12/2/10 The calcite rhomb experiment Fig. 5.1
Image of page 17

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10
Image of page 18
12/2/10
Image of page 19

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

12/2/10 Fig. 5.3
Image of page 20
Image of page 21
This is the end of the preview. Sign up to access the rest of the document.
  • Fall '10
  • Catlos
  • refractive index, Birefringence, optic axis, Uniaxial Minerals, optic axis interference

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern