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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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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