BGYCT-133 · December 2024 · English
IGNOU BGYCT-133 December 2024 Previous Year Question Paper
CRYSTALLOGRAPHY, MINERALOGY AND ECONOMIC GEOLOGY
Structured previous year question paper for BGYCT-133, December 2024 session.
Max marks: 50 · Questions: 6
Verified: 10 Aug 2026
BACHELOR OF SCIENCE (GENERAL)
(BSCG/BSCM)
Term-End Examination
December, 2024
BGYCT-133 : CRYSTALLOGRAPHY,
MINERALOGY AND ECONOMIC GEOLOGY
Time : 2 Hours Maximum Marks : 50
Note : All questions are compulsory. Marks allotted
for each questions are indicated against it.
Draw well-labelled diagrams, wherever
necessary.
Q1.Briefly answer any five of the following questions : 5x2=10
(a) Define interfacial angle.
(b) Distinguish between axial ratio and axial plane.
(c) How do you differentiate between cleavage and fracture in hand specimen ?
(d) List the minerals in the Moh’s scale of hardness.
(e) List any two distinguishing physical properties of biotite.
(f) Distinguish between isotropic and anisotropic minerals.
(g) Give four diagnostic optical properties of olivine.
(h) What are discordant ore bodies ? Give any two examples.
(i) Write any four ores of iron. Gj) List any four refractory minerals.
Q2.Write short notes on any four of the following : 4x5=20
(a) Elements of symmetry
(b) Crystal forms
(c) Physical properties of minerals of feldspar group
(d) Extinction and its types
(e) Occurrences of augite and hornblende in magnetic rocks
(f) Optical properties of muscovite and biotite
(g) Magnetic concentration
(h) Ores of copper
Q3.What is the basis for classification of crystal systems ? Discuss, in detail, crystallographic axes, symmetry elements and forms of the cubic system.
Q4.Describe the various parts of polarising microscope.
Q5.Discuss in brief the structural classification of silicate minerals.
Q6.Discuss the types, grades and origin of coal with suitable examples from Indian occurrences. aif! [71 BGYCT-133 aif