Anisotropic Minerals

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Questions and Answers

Which one of the following best describes an anisotropic mineral?

  • A mineral with the same refractive index regardless of vibration direction.
  • A mineral that exhibits different colors as a function of the vibration direction.
  • A mineral with more than one principal refractive index. (correct)
  • A mineral with only one principal refractive index.

What is the mathematical difference between the largest and smallest refractive index for an anisotropic mineral called?

  • Pleochroism
  • Birefringence (correct)
  • Dispersion
  • Indicatrix

Which of the following best describes dispersion?

  • The relationship between a mineral's crystallographic axes and optical indicatrix.
  • The change of any optical property with wavelength. (correct)
  • The three-dimensional surface describing the variation in refractive index with relationship to vibration direction of incident light.
  • The property of exhibiting different colors as a function of the vibration direction.

What is the indicatrix of an isotropic mineral?

<p>A sphere (B)</p> Signup and view all the answers

What is optical class?

<p>One of five possible classes (different indicatrices) to which a mineral can belong. (C)</p> Signup and view all the answers

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