BGYCT-133 · June 2022 · English
IGNOU BGYCT-133 June 2022 Previous Year Question Paper
CRYSTALLOGRAPHY, MINERALOGY AND ECONOMIC GEOLOGY
Structured previous year question paper for BGYCT-133, June 2022 session.
Max marks: 50 · Questions: 4
Verified: 10 Aug 2026
B. SC. (GENERAL)
(BSCG)
Term-End Examination
June, 2022
BGYCT-133 : CRYSTALLOGRAPHY,
MINERALOGY AND ECONOMIC 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
necessary.
Q1.Briefly answer any five questions of the following : 5x2=10
(a) Define crystal.
(b) What is nesosilicate ?
(c) What are etch marks ?
(d) What are the three principal phenomena of generating polarised light ?
(e) What is the hardness of kyanite ?
(f) What do you understand by gangue minerals ?
(g) What is gossan ?
(h) What is nicol prism ?
(i) List the endogenous processes of ore formation. (j) What do you understand by tenor ?
Q2.Write short notes on any four of the following : 4x5=20
(a) Unit form
(b) Crystallographic axes
(c) Crystal habits
(d) Physical properties of calcite
(e) Ores of copper
(f) Optical properties of plagioclase
(g) Minerals used in abrasive industry
(h) Origin of coal
Q3.Answer any one of the following : 10
(a) Describe the crystallographic axes, symmetry elements and forms present in the normal class of tetragonal system.
(b) Describe the optical properties of minerals studied between cross nicols.
Q4.(a) Discuss in brief the chemical classification of minerals. 5
(b) Define twinning and discuss the types of twinning present in feldspar group of minerals. 5
(a) How can you measure the interfacial angle of a crystal ? Explain with the help of well labelled diagram. 5
(b) Discuss the distribution of petroleum in India.