Optical mineralogy questions.
Find Optical mineralogy university examination questions in acaproso.com
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| 1 | Discuss in detail the optical characteristics of the following silica minerals
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| 2 | Fieldspars are the most abudant group of minerals in ignesious and metamorphic rocks. Discuss their optical properties detail. Long answers |
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| 3 | Arrange the group of plagioclases according to their anorthite content and explain what effect does the anorthite content have on the optical properties. How would you differentiate them under the polarizing microscope? Long answers |
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| 4 | A student made conoscopic microscopic observation using a length fast accessory plate and observed the features as presented in the image below:
In the area between the two isogyres interference colors change from the 2nd order to 3rd order after inserting the accessory plate. In the areas at the concave side of the two isogyres interference colors change from 2nd order to the 1st order after inserting the accessory plate.
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| 5 | Discuss the concept of ‘Compensation’ when using an accessory plate in optical mineralogy. Short answers |
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| 6 | What is the sign of elongation of a mineral grain with properties shown in the diagram below,
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| 7 | State the Snell`s law Short answers |
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| 8 | Explain in brief the meaning of critical angle. Short answers |
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| 9 | What is the difference between isotropic and anisotropic media? Short answers |
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| 10 | Mention three different but related types of polarization. Short answers |
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