BGYCT-133 · June 2025 · English
IGNOU BGYCT-133 June 2025 Previous Year Question Paper
CRYSTALLOGRAPHY, MINERALOGY AND ECONOMIC GEOLOGY
Structured previous year question paper for BGYCT-133, June 2025 session.
Max marks: 50 · Questions: 5
Verified: 10 Aug 2026
BACHELOR OF SCIENCE
(GENERAL) (BSCG/BSCM)
Term-End Examination
June, 2025
BGYCT-133 : CRYSTALLOGRAPHY,
MINERALOGY AND ECONOMIC GEOLOGY
Time : 2 Hours Maximum Marks : 50
Note: All questions are compulsory. Marks
allotted for each question are indicated
against it. Draw well labelled diagrams,
wherever necessary.
Q1.Briefly answer any five of the following questions : 5x2=10
(a) What are crystal faces ?
(b) Define plane of symmetry in crystals.
(c) Differentiate between streak and colour of minerals.
(d) List the diagnostic physical properties of garnet.
(e) What are the physical properties of calcite ?
(f) Define twinning in crystals.
(g) What is plane polarised light ?
(h) What are syngenetic ore deposits ?
(i) List the exogenous processes of ore formation. G) Define wall rock alternation in the context of ore formation.
Q2.Write short notes on any four of the following : 4x5=20
(a) Crystallographic axes
(b) Parts of a crystal
(c) Physical properties of biotite and muscovite
(d) Physical properties of orthoclase and plagioclase
(e) Interference colours
(f) Polariser and analyser in polarizing microscope
(g) Building materials
(h) Industrial minerals
Q3.Describe crystallographic axes, symmetry elements and forms of the orthorhombic crystal system.
Q4.Describe optical properties of quartz, olivine, augite, biotite and hornblende.
Q5.What are rock-forming minerals ? Describe any four groups of rock-forming silicate minerals. 10
(a) Discuss the distribution of coal in India. 5
(b) Define ore. Discuss the processes of formation and geographical distribution of iron deposits of India. 5 ART |