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Optical Mineralogy - Optical Indicatrix, Uniaxial vs Biaxial, Interference Figures - GEO GIRL

GEO GIRL via YouTube

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Overview

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This course explains how crystal symmetry affects mineral optical properties and how to use optical indicatrices, optic axes, optic signs, and interference figures to identify minerals in thin section. It also introduces Bertrand and condensing lenses used with petrographic microscopes.

Syllabus

Review & what this video will cover
How crystal system affects optical properties of minerals
Intro to optical indicatrix
The uniaxial optical indicatrix
Uniaxial optic axis
The biaxial indicatrix and optic axes
Biaxial optic angle and optic sign
How to apply this to minerals under thin section?
Bertrand lens & condensing lens
Uniaxial interference figures
Uniaxial flash figures
How to determine optic sign of uniaxial minerals
Biaxial interference figures
Biaxial optic angle or 2V angle
Acute bisectrix figure & obtuse bisectrix figures
Biaxial optic sign
Review mineral identification chart
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GEO GIRL

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