IIT JAM
Nitish Asked a Question
November 22, 2020 6:59 pmpts 30 pts
  • IIT JAM
  • Geology (GG)

12. a certain crystal has a 3-fold axis of rotation but no 4-fold axis of rotation or rotoinversion. there might be other symmetry elements.the possibilities fo

12. A certain crystal has a 3-fold axis of rotation but no 4-fold axis of rotation or rotoinversion. There might be other symmetry elements.The possibilities for the system of this crystal is/are a. trigonal and hexagonal trigonal and cubic b. C. hexagonal and cubic d. trigonal only
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  • Sajan sarthak
    Trigonal only don't be confused with bar6 that is 3/m 3fold axis and it's perpendicular mirror plane. Trigonal divison of hexagonal class cubic has 3 fold but it has 4 fold t...
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  • Saurabh thankyou
    Correct answer will be – A(Trigonal and Hexagonal ) . While in case of cubic system, you don't have four fold axis of rotation or rotoinversion only in the case of Tetartoidal and ...
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