1. CRYSTALLOGRAPHY TRIVIA ROUND 2!

2. Round 2 – Question 1 Excluding AB, crystal faces will
most likely occur
along which
lattice plane?

3. Round 2 – Question 2
What does Steno’s Law of Interfacial Angles state?

4. Round 2 – Question 3
What does the crystal growth illustration to the left indicate?
lattice plane a has a higher atomic density than o,
Lattice plane o has a higher growth rate than a, or
111 faces are only common in large, mature crystals

5. Round 2 – Question 4
The crystallographic axes shown below are indicative of what crystal system?

6. Round 2 – Question 5
How are crystallographic axes different between the orthorhombic and tetragonal systems?

7. Round 2 – Question 6
What crystal face would qualify as the “unit face” in this orthorhombic crystal? (give face intercepts)

8. Round 2 – Question 7
What is the Miller Index for the upper face?

9. Round 2 – Question 8
What is the Miller index of the shaded face in this hexagonal crystal?

10. Round 2 – Question 9
Faces b, m, and a belong to what zone?
[_ _ _]

11. Round 2 – Question 10
What is the form index of the p face?
{_ _ _}

12. End of Round 2
Pass your answers to the team on your right for grading.

13. Round 2 – Question 1 Excluding AB, crystal faces will
most likely occur
along which
lattice plane? AC

14. Round 2 – Question 2
What does Steno’s Law of Interfacial Angles state?
For a particular mineral, the angle between adjacent faces will be constant regardless of crystal shape or size.

15. Round 2 – Question 3
What does the crystal growth illustration to the left indicate?
lattice plane a has a higher atomic density than o,
Lattice plane o has a higher growth rate than a, or
111 faces are only common in large, mature crystals

16. Round 2 – Question 4
The crystallographic axes shown below are indicative of what crystal system?
Hexagonal

17. Round 2 – Question 5
How are crystallographic axes different between the orthorhombic and tetragonal systems?
The a and b axes in the tetragonal system are the same length, but are different in orthorhombic crystals.

18. Round 2 – Question 6
What crystal face would qualify as the “unit face” in this orthorhombic crystal? (give face intercepts)
1a: 1b: 1c

19. Round 2 – Question 7 What is the Miller Index for the upper face?
(113)

20. Round 2 – Question 8
What is the Miller index of the shaded face in this hexagonal crystal?
(1120)

21. Round 2 – Question 9
Faces b, m, and a belong to what zone?
[001]

22. Round 2 – Question 10
What is the form index of the p face?
{111}