Optical mineralogy UE Past Papers Questions.

What axis makes the acute bisector of 2V for:

1. Biaxial negative mineral
2. Biaxial positive mineral

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In which position and why does an anisotropic mineral become extinct when viewed under a crossed polar microscope.

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What is an extinction angle?

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Using petrographic polarizing microscope, outline the procedures for determining Optical character for anisotropic minerals.

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Using the optical indicatrix, explain the difference between Uniaxial and Biaxial minerals.

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