IIT JAM
Gurmeet singh Asked a Question
February 3, 2021 12:53 ampts 30 pts
  • IIT JAM
  • Geology (GG)

Under crossed polars, a mineral remains dark at all stages of rotation of the microscope stage. which of the following statement(s) is/are not correct? (a) the

Under crossed polars, a mineral remains dark at all stages of rotation of the microscope stage. Which of the following statement(s) is/are NOT correct? (A) The mineral is isotropic. (B) The mineral is biaxial with an optic orientation corresponding to the principal section of the indicatrix. (C) The mineral is biaxial with an optic orientation containing the Y-vibration direction only. (D) The mineral is uniaxial with an orientation perpendicular to the optic axis.
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  • Asif ali Best Answer
    A,C,D will be the condition to found a dark minerals under 360° rotation of microscopic stage under XPL. basically for example Garnet is an isotropic mineral and appears dark of 36...
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