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Vaibhav singh Asked a Question
July 14, 2021 2:33 pmpts 30 pts
  • IIT JAM
  • Geology (GG)

206. inclined extinction is shown by: a calcite b. basal section of augite c. basal section of hornblende d. none of the above (bhu-2010)

206. Inclined extinction is shown by: A Calcite B. Basal section of augite C. Basal section of hornblende D. None of the above (BHU-2010) How to solve this type of Q in which sections and category of extinction is related?? I have encountered in theory that Extinction angle measured on a specific mineral in thin section or grain mount depends exactly on grain orientation!! PLEASE CLARIFY ALL THESE confusion of HOW section of minerals RELATED TO EXTINCTION!
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  • Vaibhav singh
    thanks mayank bhaiya..Actually this page of Nesse was unclear to me..You made it clear. .
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  • Mayank vedwal Vedwal Best Answer
    Here option D is correct.... For answering this question I want to clear few points :- 1) Only monoclinic and triclinic minerals show inclined extinction not hexagonal, orthorhomb...
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