BGYCT-133 · December 2025 · English
IGNOU BGYCT-133 December 2025 Previous Year Question Paper
CRYSTALLOGRAPHY, MINERALOGY AND ECONOMIC GEOLOGY
Structured previous year question paper for BGYCT-133, December 2025 session.
Max marks: 50 · Questions: 4
Verified: 10 Aug 2026
BACHELOR OF SCIENCE (GENERAL) /
BACHELOR OF SCIENCE
(MULTIDISCIPLINARY)
(BSCG/BSCM)
Term-End Examination
December, 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 required.
Q1.Briefly answer any five questions from the following : 5x2=10
(a) Define crystal habit.
(b) What is a Pinacoid ?
(c) Define Metallogenic epoch.
(d) What are idiochromatic minerals ?
(e) Differentiate between Carlsbad twinning Polysynthetic twinning.
(f) Give two optical properties of hornblende.
(g) Define tenacity.
Q2.Write short notes on any four of the following : 4x5=20
(a) Applications of minerals in war
(b) Late magmatic process C-2795] BGYCT-133
(c) Chief ores of copper
(d) Building materials
(e) Microscopic unit of coal
(f) Forms present in cubic system
Q3.Answer any one of the following questions : 1x10=10
(a) Discuss briefly about the crystallo- graphic axes, symmetry elements and forms of tetragonal system.
(b) Discuss the process of formation of iron- ores. Elaborate on the distribution of Indian iron-ore deposits based on their origin and mineralization.
Q4.(a) Discuss the distribution of important lead-zinc deposits of economic value found in India. 5
(b) Discuss the crystallographic axes and symmetry elements of hexagonal system. 5
(a) Discuss the mode of occurrence and distribution of mica in India and its uses. 5
(b) Discuss the reasons for the variation in the colour of minerals. 5 C-2795] BGYCT-133 1x10=10