M.Sc. DEGREE EXAMINATION, NOVEMBER 2017
Second Semester
Geology
ADVANCED CRYSTALLOGRAPHY AND MINERALOGY
(CBCS 2015 onwards)
Time 3 Hours Maximum 75 Marks
Part A (10 x 2 20)
Answer all questions.
1. Define Twinning and give an example.
2. What are X-rays?
3. Define Polarisation.
4. Define Birefringes.
5. Define biaxial minerals and give an example.
6. What is Mallard's formula?
7. Define Isomorphism with examples.
8. Write the minerals of aluminosilicates group with their
chemical composition.
9. Define sheet silicates with examples.
10. What is the chemical composition of Albite and
Anorthite?
Sub. Code
5MGE2C1
AFF-5075
2
wk14
Part B x 5 25)
Answer all questions.
11. Write short note on Bragg's law and its
applications.
Or
Write in brief about 14 Bravais space lattices.
12. Describe how refractive index of minerals can be
determined by immersion method?
Or
Give a brief account on uniaxial indicatrix.
13. Write short note on pleochroic scheme.
Or
Give short note on interference figure.
14. Write notes on optical properties of Pyroxene.
Or
Give a brief account on Garnet group of minerals.
15. Explain the mineralogy and physical properties of
Calcite?
Or
Write short note on Feldspathoid group.
AFF-5075
3
wk14
Part C x 10 30)
Answer any three questions.
16. Write an essay on Shoenflion crystal notation of 32
classes with suitable examples and sketches.
17. Define extinction. Write in detail about the determination
of extinction angle with neat sketches.
18. Give detail account on U stage techniques for
determination of Anorthite content.
19. Write an essay on physical, optical properties,
compositions and mode of occurrence of Amphibole group
of minerals.
20. Write an essay on physical, chemical, optical properties
and uses of Quartz group of minerals.
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