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

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12/2/10 Isometric =isotropic minerals: Garnet Gold Copper Magnetite Pyrite
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12/2/10 Fluorite Spinel Chromite Halite
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12/2/10
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12/2/10 Glass is isotropic Glass is isotropic PPL XPL
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12/2/10
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12/2/10
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12/2/10 Crystal system
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12/2/10 FIG. 4.1
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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
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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
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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
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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
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12/2/10 Garnet in plane polarized light (ppl)
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12/2/10 (FeCaMnMg)3Al2(SiO4)3 (Fe, Mg, Al)6(Si, Al)4O10(OH)8 Garnet chlorite Garne t chlorit e
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12/2/10 The calcite rhomb experiment Fig. 5.1
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12/2/10
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12/2/10 Fig. 5.3
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