Section
1. Write on the above with diagrams as necessary
12x5=60

Acute bisectrix interference figure of a biaxial crystal.
Principle of X-ray diffraction study of a crystalline mineral.
Distinguish andesite from dolerite by studies in thin sections.
How the direction of flow of the sedimentcarrying fluid is determined in a rock?
Write on zones of metamorphism with special reference to an area in India.

2. Discuss basis of classification of silicate
structures of minerals. 20
Describe with a diagram the approximate
limits of solid solution in the felspar group of
minerals. 20
Write on the principle of stereographic projection of crystals. Draw a sketch of the stereogram of a tetragonal crystal. 15+5=20

3. Show how you determine the pleochroic scheme of a biaxial mineral. 20

Write notes on the above with diagrams.
!Ox4=40

Dispersion of axial angle in brookite (Ti02)
Powder X-ray diffraction method
Granulose structure and its origin
Trachytic and graphic texture

4. Write a note on the cosmic abundance of elements and their significance. 20
Draw the diagram of Mg2Si04 Fe2Si04 Si02 and write its implication in the crystallization of basic magma. 20
Write on the metamorphism of argillaceous rocks. 20

Section
5. Write on the geology and origin of stratiform and alpine-type chromite deposits in the world.
Enumerate the main factors of accretion of Mn-nodules on the ocean floor and their future mining possibilities.
Write on geophysical methods of exploration of oil deposits.
Comment on application of air-borne survey in mineral exploration.
Describe effects of Jong term application of nitrate fertilizers on ground water regime.
12x5=60

6. Write on the genesis and occurrences of the above mineral deposit in India: 10x3=30
Sillimanite
Baryte
Mn-ores

Write short notes on 10x3=30
Chondrite and tektite
Duty and responsibility of sample collector in mineral prospection
Mercury pollution

7. Write notes on the above with sketche as necessary:
Name and discuss on Antarctic meteorites
originating from the Moon. 20

Kamacite and octahedrite. 10
Meteorite crater in India and its age. 10
Anorthosite provinces of India and their origin. 20

8. Name the minerals used as refractories in Industries and cite their respective occurrences in India. 20
Write on the sea-level changes through the geological history, and the associated environment and life, as known from fossil and sedimentary records. 20
Explain marine pollution in India. Comment on the analytical techniques that are widely used for determining toxic elements in water.
20