Intro_Optical_Mineralogy

Intro_Optical_Mineralogy - Optical Mineralogy Primary way...

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Optical Mineralogy • Primary way to observe minerals: - Grain mounts - Thin sections • Tool relies on interaction of minerals and polarized light. • Important: cheap, quick, easy, only way to determine textures Light • Electromagnetic energy derived from excess energy of electrons • Particle, Wave, or both? - Particles = photons - For mineralogy, consider light a wave - Important wave interference phenomenon • Light has both electrical and magnetic energy - Two components vibrate perpendicular to each other - vibrate perpendicular to direction of propogation - Electrical component interacts with electrical properties of minerals • Physical description similar to wave: - v = velocity - λ = wavelength - f = v/ λ • Two light waves that vibrate at an angle to each other: 1
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- vibrations interfere with each other - interference creates a new wave - direction determined by vector addition • Vibration direction of single wave can be split into various components with different vibration directions
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Intro_Optical_Mineralogy - Optical Mineralogy Primary way...

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