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IT’S TIME FOR... CRYSTALLOGRAPHY TRIVIA!!

IT’S TIME FOR... CRYSTALLOGRAPHY TRIVIA!!. Rules. Three rounds 10 questions per round Pass answers to team to right for grading. Round 1 – Question 1. What is the term to describe a crystal that displays imperfectly developed crystal faces?. Round 1 – Question 2.

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IT’S TIME FOR... CRYSTALLOGRAPHY TRIVIA!!

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  1. IT’S TIME FOR...CRYSTALLOGRAPHYTRIVIA!!

  2. Rules • Three rounds • 10 questions per round • Pass answers to team to right for grading

  3. Round 1 – Question 1 What is the term to describe a crystal that displays imperfectly developed crystal faces?

  4. Round 1 – Question 2 Mineral symmetry is manifest by external symmetry of single crystals and by internal symmetry of atomic arrangement. What is the main difference between external and internal symmetry elements?

  5. Round 1 – Question 3 What are the four types of external symmetry operations? (must know all four)

  6. Round 1 – Question 4 Two-fold roto-inversion is equivalent to what other symmetry operation

  7. Round 1 – Question 5 What is the Herman-Maugin notation for the symmetry operations shown here?

  8. Round 1 – Question 6 Which is the proper Point Group label (Herman–Maugin notation) for the symmetry operations shown to the left? 4mm 4/m2/m2/m 4/m2/m 422

  9. Round 1 – Question 7 How many crystal classes (point groups) are possible to describe external symmetry?

  10. Round 1 – Question 8 Rank the six major crystal systems in order of increasing symmetry. Isometric Monoclinic Triclinic Orthorhombic Tetragonal Hexagonal

  11. Round 1 – Question 9 The point group 4/m32/m belongs to what crystal system?

  12. Round 1 – Question 10 The crystal class (point group) 2/m symmetry shown here belongs to what crystal system?

  13. End of Round 1 Pass your answers to the team on your right for grading.

  14. Round 1 – Question 1 What is the term to describe a crystal that displays imperfectly developed crystal faces? Subhedral

  15. Round 1 – Question 2 Mineral symmetry is manifest by external symmetry of single crystals and by internal symmetry of atomic arrangement. What is the main difference between external and internal symmetry elements? Internal Symmetry involves translation, external symmetry does not

  16. Round 1 – Question 3 What are the four types of external symmetry operations? (must know all four) Rotation Reflection (or Mirrors) Center of Symmetry Roto-Inversion

  17. Round 1 – Question 4 Two-fold roto-inversion is equivalent to what other symmetry operation Mirror Plane

  18. Round 1 – Question 5 What is the Herman-Maugin notation for the symmetry operations shown here? 422

  19. Round 1 – Question 6 Which is the proper Point Group label (Herman–Maugin notation) for the symmetry operations shown to the left? 4mm 4/m2/m2/m 4/m2/m 422

  20. Round 1 – Question 7 How many crystal classes (point groups) are possible to describe external symmetry? 32

  21. Round 1 – Question 8 Rank the six major crystal systems in order of increasing symmetry. Triclinic Monoclinic Orthorhombic Tetragonal Hexagonal Isometric

  22. Round 1 – Question 9 The point group 4/m32/m belongs to what crystal system? Isometric

  23. Round 1 – Question 10 The crystal class (point group) 2/m symmetry shown here belongs to what crystal system? Monoclinic

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