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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- 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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Saurabh 1
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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 Diploidal crystal class, but other three crystal classes of this system will have either four fold axis of rotation or rotoinversion. Clearly you cannot find four fold axis rotation in case of trigonal and hexagonal system.
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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 too.