BGYCT-133 · June 2023 · English
IGNOU BGYCT-133 June 2023 Previous Year Question Paper
CRYSTALLOGRAPHY, MINERALOGY AND ECONOMIC GEOLOGY
Structured previous year question paper for BGYCT-133, June 2023 session.
Max marks: 50 · Questions: 4
Verified: 10 Aug 2026
BACHELOR OF SCIENCE (GENERAL)
(BSCG)
Term-End Examination
June, 2023
BGYCT-133 :CRYSTALLOGRAPHY,
M NERALOGY AND ECONOMY GEOLOGY
Time : 2 Hours Maximum Marks : 50
Note :
(i) All questions are compulsory.
(ii) Marks allotted for each question are
indicated against it.
(iii) Draw well-labelled diagrams, wherever
required.
Q1.Briefly answer any five questions of the following : 5x2=10
(a) Define gangue.
(b) What is dome ? [2] BG YCT 133
(c) Define Bragg’s law.
(d) What are pleochroic haloes ?
(e) How will you distinguish between euhedral and subhedral shape of the mineral under the polarising microscope ?
(f) Differentiate between metallic and non- metallic lustre.
(g) Draw crystal structure of cyclosilicate.
(h) What is polysynthetic twinning ?
(i) Give two diagnostic properties of calcite observed in thin section. G) What is conchoidal fracture ?
Q2.Write short notes on any four of the following : 4x5=20
(a) Optical properties of hornblende
(9) Discordant ore bodies
(c) Varieties and ranks of coal [3] BG YCT 133
(d) Minerals used in refractory industry
(e) Chief ores of aluminium
(f) Residual and mechanical concentration
(g) Symmetry elements and forms of Zircon
(h) Rock-forming minerals
Q3.Answer any one of the following questions : 1x10=10
(a) Describe the structural classification of silicates with the help of neat well labelled diagrams.
(b) Define cleavage. Explain different types of cleavages found in minerals observed under the polarising microscope. Give examples wherever required.
Q4.(a) Discuss origin, mode of occurrence and uses of petroleum. 5
(b) Discuss contact metamorphism and contact metasomatism processes of ore formation. 5 [4] BG YCT 133
(a) Discuss origin, mode of occurrence and uses of gypsum. 5
(b) Explain crystallographic axes, symmetry elements and forms of normal class of hexagonal system. Draw neat and well- labelled diagrams wherever required. 5 [5] BG YCT 133 P.T.0. [6] BG YCT 133 [7] BG YCT 133 [8] BG YCT