GEOL/II/02 Student's Copy
2 0 1 8
Pre-CBCS
2nd Semester
GEOLOGY
SECOND PAPER
Crystallography and Mineralogy
Full Marks 55
Time 2½ hours
PART A—OBJECTIVE
Marks 20
The figures in the margin indicate full marks for the questions
SECTION—A
Marks 5
Tick the correct answer in the brackets provided 1×5=5
1. The general appearance of a mineral surface under reflected light is known
as
color
streak
luster
pleochroism
2. Fe3O4 is the chemical composition of
hematite
magnetite
ilmenite
chromite
/381 1 Contd.
3. Cross-hatch twinning is the diagnostic property of
plagioclase
orthoclase
microcline
sanidine
4. The point of intersection of three or more faces of a crystal is known as
solid angle
interfacial angle
apex
edge
5. Which of the following instruments is used to study clay minerals?
XRF
XRD
ICPMS
EPMA
SECTION—B
Marks 15
Write notes on the following 3×5=15
1. Cleavage
2. Uniaxial minerals
3. Parameters
4. Plane of symmetry
5. Rare earth elements
GEOL/II/02/381 2 Contd.
PART B—DESCRIPTIVE
Marks 35
The figures in the margin indicate full marks for the questions
Answer five questions, taking one from each Unit
UNIT—I
1. Write notes on any two of the following 3½×2=7
Forms of igneous rocks
Bowen's reaction series
Structure of igneous rocks
2. Write on the following 3½×2=7
Specific gravity of minerals
Hardness
UNIT—II
3. Write on any two of the following 3½×2=7
Covalent bond
Ionic bond
Mass number
4. Write the physical properties of any two of the following rock forming
minerals 3½×2=7
Biotite
Hypersthene
Garnet
GEOL/II/02/381 3 Contd.
UNIT—III
5. Write short notes on the following 3½×2=7
Isotropic and anisotropic substances
Optical properties of quartz
6. Describe, in brief, the parts and functioning of petrological microscope. 7
UNIT—IV
7. Write a note on any one of the following 7
Crystallographic axes and angles
Miller indices
8. With the help of a neat diagram, describe the symmetry elements of
orthorhombic system. Also name one mineral crystallizing in orthorhombic
system.
UNIT—V
9. Write the principle and application of XRD. 7
10. Write on the following 3½×2=7
SEM
Petrograph