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OPTICAL MINERALOGY TRIVIA ROUND 2!

OPTICAL MINERALOGY TRIVIA ROUND 2!. Round 2 – Question 1. Under cross-polars, when will this mineral go to extinction?. Round 2 – Question 2. The interference colors shown by a mineral under cross-polars depends on the thickness of the mineral and what else?. Round 2 – Question 3.

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OPTICAL MINERALOGY TRIVIA ROUND 2!

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  1. OPTICAL MINERALOGYTRIVIAROUND 2!

  2. Round 2 – Question 1 Under cross-polars, when will this mineral go to extinction?

  3. Round 2 – Question 2 The interference colors shown by a mineral under cross-polars depends on the thickness of the mineral and what else?

  4. Round 2 – Question 3 When a mineral shows nearly black interference colors, what type of indicatrix section is in the plane of the mineral?

  5. Round 2 – Question 4 What type of optic figure is this?

  6. Round 2 – Question 5 What causes the black isogyres

  7. Round 2 – Question 6 What is the optic sign indicated by this figure?

  8. Round 2 – Question 7 Which two vibration directions in this biaxial indicatrix will display maximum birefringence?

  9. Round 2 – Question 8 This is an example of a negative biaxial indicatrix. What is does this imply about the relative values of ,  and ?

  10. Round 2 – Question 9 What type of optic figure is this?

  11. Round 2 – Question 10 If the colors go up in figure C, what does this imply about the sign of elongation?

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

  13. Round 2 – Question 1 Under cross-polars, when will this mineral go to extinction? When the O & E vibration directions are parallel to the polarizing directions (N-S/E-W)

  14. Round 2 – Question 2 The interference colors shown by a mineral under cross-polars depends on the thickness of the mineral and what else? birefringence or difference in two indicies of refraction in section

  15. Round 2 – Question 3 When a mineral shows nearly black interference colors, what type of indicatrix section is in the plane of the mineral? circular section

  16. Round 2 – Question 4 What type of optic figure is this? uniaxial optic axis figure

  17. Round 2 – Question 5 What causes the black isogyres Alignment of two vibration directions parallel to polarizers

  18. Round 2 – Question 6 What is the optic sign indicated by this figure? Positive

  19. Round 2 – Question 7 Which two vibration directions in this biaxial indicatrix will display maximum birefringence?  and 

  20. Round 2 – Question 8 This is an example of a negative biaxial indicatrix. What is does this imply about the relative values of ,  and ?  is closer to  than to 

  21. Round 2 – Question 9 What type of optic figure is this? Acute Bisectrix (Bxa)

  22. Round 2 – Question 10 If the colors go up in figure C, what does this imply about the sign of elongation? Length slow

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