review - trivia rnd 1.ppt
TRANSCRIPT
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8/10/2019 Review - Trivia rnd 1.ppt
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ITS TIME FOR...
CRYSTALLOGRAPHY
TRIVIA!!
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Rules
Three rounds
10 questions per roundPass answers to team to
right for grading
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Round 1 Question 1
What is the term to describe acrystal that displays
imperfectly developed crystalfaces?
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Round 1 Question 2
Mineral symmetry is manifest by externalsymmetry of single crystals and byinternal symmetry of atomicarrangement.
What is the main difference betweenexternal and internal symmetryelements?
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Round 1 Question 4
Two-fold roto-inversion is equivalent towhat other symmetry operation
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Round 1 Question 5
What is the Herman-Maugin notation for the
symmetry operationsshown here?
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Round 1 Question 6
Which is the properPoint Group label(HermanMaugin
notation) for thesymmetry operationsshown to the left?
4mm 4/m2/m2/m4/m2/m 422
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Round 1 Question 7
How many crystal classes (point groups)are possible to describe externalsymmetry?
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Round 1 Question 9
The point group4/m32/m
belongs to whatcrystal system?
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Round 1 Question 10
The crystal class(point group) 2/m
symmetry shown herebelongs to whatcrystal system?
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End of Round 1
Pass your answers to the team on yourright for grading.
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8/10/2019 Review - Trivia rnd 1.ppt
14/23
Round 1 Question 1
What is the term to describe acrystal that displays
imperfectly developed crystalfaces?
Subhedral
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Round 1 Question 2
Mineral symmetry is manifest by externalsymmetry of single crystals and byinternal symmetry of atomic arrangement.
What is the main difference betweenexternal and internal symmetry elements?
Internal Symmetry involves translation,external symmetry does not
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Round 1 Question 3
What are the four types of externalsymmetry operations? (must know allfour)
Rotation
Reflection (or Mirrors)Center of Symmetry
Roto-Inversion
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Round 1 Question 4
Two-fold roto-inversion is equivalent towhat other symmetry operation
Mirror Plane
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Round 1 Question 5
What is the Herman-Maugin notation for the
symmetry operationsshown here?
422
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Round 1 Question 7
How many crystal classes (point groups)are possible to describe externalsymmetry?
32
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Round 1 Question 8
Rank the six major crystal systems inorder of increasing symmetry.
TriclinicMonoclinicOrthorhombic
TetragonalHexagonalIsometric
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Round 1 Question 9
The point group4/m32/m
belongs to whatcrystal system?
Isometric
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Round 1 Question 10
The crystal class(point group) 2/m
symmetry shown herebelongs to whatcrystal system?
Monoclinic