TEST-2 : MINERALOGY

   MINERALOGY AND CRYSTALLOGRAPHY

MCQ (1 Mark)

1) Which of the following property is not seen under XPL?

A) Interference Color

B) Extinction

C) Pleochroism

D) Interference Figure

2) In the holosymmetric class of the Cubic System, how many more faces does the {110} form have compared to the {111} form?

A) 2

B) 4

C) 6

D) 8

3) Which of the following minerals crystallizes in the monoclinic system?

A) Pigeonite

B) Tourmaline

C) Beryl

D) Pyrite

4) Match the crystal forms (listed in Group I) with their corresponding number of faces (listed in Group II).

A) Rhombohedron

B) Dodecahedron

C) Tetrahedron

D) Dome

5) Silicon is the most abundant element (after oxygen) in which of the following options?

A) In the bulk earth composition

B) In the crustal composition

C) In the core composition

D) None of the above

6) Which of the following mineral is not showing two sets of cleavage?

A) Hornblende

B) Augite

C) Anorthite

D) Biotite

7) Match the minerals in Group I with their respective silicate structures in Group II.

A) Hortonolite

B) Augite

C) Hornblende

D) Zeolite

8) Quartz can be optically distinguished from nepheline based on:

A) Relief

B) Birefringence

C) Optic sign

D) Extinction angle

9) Pneumatolytic structure is shown by ______ mineral.

A) Garnet

B) Olivine

C) Pyroxene

D) Topaz

10) ______ is least susceptible to Weathering.

A) Olivine

B) Pyroxene

C) Quartz

D) Mica

MCQ (2 Marks)

11) Relate the cleavage with their examples.

A) Gypsum

B) Mica

C) Fluorite

D) Kyanite

12) The least hardest non-silicate mineral in Moh's scale of Hardness is ______

A) Talc

B) Gypsum

C) Calcite

D) Fluorite

13) The NBO: BO ratio in double chain Inosilicates is ______

A) 6:5

B) 5:6

C) 4:5

D) 5:4

14) Glaucophane is a dense mineral because:

A) Na occurs in the ‘A’ site while Al is in the octahedral site

B) Na occurs in the ‘A’ site while Al is in the tetrahedral site

C) Na occurs in the ‘M4’ site while Al is in the octahedral site

D) Na occurs in the ‘M4’ site while Al is in the tetrahedral site

15) If the angle of incidence is 30°, then the wavelength for first-order spectrum is equal to:

A) d/2

B) 2d

C) d

D) d/3

16) Which of the following twinning is shown by Quartz?

A) Carlsbad

B) Braveno

C) Maneback

D) Douphine

17) Yellow pleochroic haloes are commonly seen in:

A) Muscovite

B) Biotite

C) Cordierite

D) Orthoclase

18) Match the gemstones in Group I with corresponding minerals in Group II.

A) Amazonite

B) Sapphire

C) Alabaster

D) Aquamarine

19) Silica - over saturated minerals are:

A) Nepheline and albite

B) Olivine and enstatite

C) Quartz and orthoclase

D) Olivine and leucite

20) Which of the following pairs of minerals exhibit exsolution texture?

A) Pyrite-Pyrrhotite

B) Pyrite-Chalcopyrite

C) Sphalerite-Pyrrhotite

D) Hematite-Magnetite

21) Which of the following statement is true for isomorphism?

A) Having identical chemical composition and different crystal structure

B) Having different chemical composition and identical crystal structure

C) Having both different chemical composition and crystal structure

D) None of the above

22) Which of the following is TRUE for the coordination number (n) of Silicon?

A) n = 4 in both plagioclase and garnet

B) n = 6 in both plagioclase and garnet

C) n = 4 in plagioclase and n = 6 in garnet

D) n = 6 in plagioclase and n = 4 in garnet

23) Which of the following is having highest stability order?

A) Quartz

B) Tridymite

C) Stishovite

D) Cristobalite

24) The twin plane in the Braveno law is:

A) (010)

B) (001)

C) (100)

D) (021)

25) Which of the following statement is incorrect regarding Sanidine and Microcline?

A) Both are belongs to Alkali Feldspar group

B) Both crystalizes in Triclinic system

C) Sanidine crystallizes in Monoclinic system whereas Microcline crystalizes in Triclinic System

D) Both are having Chemical formula of KAlSi3O8

26) Match the mineral habits (listed in Group I) with the minerals (listed in Group II).

A) Beryl

B) Natrolite

C) Wollastonite

D) Bauxite

27) Which among the following lacks centre of Symmetry?

A) Hemihedral

B) Holohedral

C) Hemimorphic

D) Tetraoctahedral

28)Determine the correctness otherwise the following assertion or reason.

A) Both [a] and [r] are true and [r] is the correct reason for [a]

B) [a] is true but [r] is false

C) [a] is false but [r] is true

D) Both [a] and [r] are true but [r] is not the correct reason for [a]

29) When refractive index of crystal is more than refractive index of epoxy: or the surrounding medium is known as:

A) High relief +

B) High relief -

C) Low relief +

D) Can be both A and B

MSQ (2 Marks)

31) Which of the following Moh's minerals is/are having cubic system and shows Isoaxial optic axes?

A) Orthoclase

B) Fluorite

C) Talc

D) Diamond

32) Which of the following minerals are belong to Nesosilicates?

A) Sphene

B) Topaz

C) Zircon

D) Chlorite

33) State the correct matching Of Crystal system with their No of mirror planes or Plane of symmetry.

A) Cubic - 9

B) Tetragonal - 6

C) Monoclinic - 0

D) Orthorhombic - 4

34) Which of the following pair belongs to Polymorphism?

A) Calcite-Aragonite

B) Sanidine - Microcline

C) Anorthite - Bytownite

D) Andalusite - Kyanite

35) Which of the following correlation(s) are Correct regarding Moh's Scale of Hardness?

A) Silicates - 4

B) Oxides- 3

C) Hydrous - 4

D) Phosphate - 1

36) Choose the correct Statement(s):

A) Glide Plane is the Combination of Reflection and Translation

B) Screw Axes is the Combination of Rotation and translation

C) Reflection refers to the Plane of Symmetry

D) Pinacoid is an Open form made up of two Non-Parallel faces

37) Choose the incorrect correlation of the crystal systems with their corresponding Normal class.

A) Cubic - Galena

B) Orthorhombic - Beryl

C) Triclinic - Axinite

D) Monoclinic - Gypsum

38) Which of the following mineral(s) shows High relief?

A) Garnet

B) Tourmaline

C) Diamond

D) Fluorite

39) Which of the following statements are true regarding extinction of minerals?

A) Quartz shows Undulose or Wavy extinction

B) In clinopyroxenes 100 section gives Inclined extinction

C) In clinopyroxenes 100 section gives Straight extinction

D) Inclined extinctions are Parallel to the upper and lower Polarizer

NAT (1 Mark)

1) Find out the co-ordination number if the strength of electrostatic bond is 3 and cation is Fe^3+.

2) The unit cell of an orthorhombic mineral was compressed during deformation from 5 A° to 4.5 A°along C-axis,with two other dimensions remaining unaffected. The absolute value of the shift in the position of the(001) peak it’s XRD pattern is ______ 2Theta°.

3) The weight Proportion of Na in NaAlSi3O8 is ______ (Answer upto 2 decimals)

4) The bond strength of fluorite CaF2 will be ______ if radii sum is 2.52 A and radius of Ca is 1.21A.

5) If (3 4 6 ) is the miller index of a crystal face , the value of y in the weiss parameter is ______

6) The core and rim compositions of garnet are (Fe0.90Ca1.45Mn0.65)Al2Si3O12 and (Fe0.65Ca0.80Mn1.55)Al2Si3O12, respectively. The difference in mole fractions of almandite between the core and the rim is ______ (answer in two decimal place).

7) In face centered cubic (FCC)structure and body centered cubic(BCC) structure what will be the ratio (FCC/BCC) of atoms present in per unit cell?

8) A oil medium has refractive index 1.34. A light beam passes from a muddy water medium (High density) to the oil medium, whose angle of incidence is 45° and refracted 90° to the wave normal. Find the refractive index of the muddy water medium? (Write up to 2 decimals)

9) Calculate the birefringence of a mineral having thickness in thin section 0.03mm and retardation is 750nm.(write up to 2 decimals)

10) In body centered cubic structure length of sides of cube(a) is 5 A and radius of anion is 2.5 A what will be the radius of anion? (write up to 2 decimals)

NAT (2 Marks)

11) Calculate the wt% of FeO in CaFeSi2O6.(Answer upto two decimals) Given molecular wt of CaO=56.079, FeO=71.846, SiO2 = 60.084

12) The retardation of a uniaxial negative mineral of thickness 0.03 mm is 5160 nm in its principal section of indicatrix. If the refractive index corresponding to the E-ray is 1.486, the value of the refractive index (correct to three decimal places) of the O-ray is ______

13) A crystal has lattice parameters of a: 4.26 Å, b: 10 Å and c: 3.44 Å, respectively. A plane intercepts on the a, b and c axes at 2.13 Å, 10 Å and 1.72 Å, respectively. The Miller Indices for the plane written as an integer, is (Answer in integer).

14) A Basalt has 9.47% CaO and 350 ppm of Sr . the Ca/Sr ratio of the Basalt is ______ (Answer upto 3 decimal places) Given Atomic wt of Ca= 40 u, O= 16 u

15) Aluminium (Al) can occur in both tetrahedral and octahedral co-ordination in Silicates . The amount of Octahedral(Al) in pyroxene crystal of Composition Mg1.4 Fe0.5 Al0.3 Si1.8 O6 is ______ (Answer in one decimal place)

16) The core and rim composition of Olivine are follows Core - Mg 1.7 Fe x SiO4 Rim - Mg 1.3 Fe y SiO4 The amount of increase in Fe atom from core to rim per formula unit of Olivine is ______ (give answer in one decimal place)

17) CaF2 adopts the face centered cubic structure with the lattice parameter a=5.463Å , If Ionic radii of Anion is 1.71Å, then calculate the ionic radii of cation Ca2+ in Å. (Answer upto two decimal Place)

18) Light ray passes from mineral A to mineral B having refractive index of mineral A is 1.65 and for mineral B is 1.42; angle of incidence will be critical angle if incidence ray is critically refracted: (answer upto one decimal place)

19) X-ray of wavelength 1.5418A° are diffracted by (111) planes in a crystal at an angle of 30°in the first order. Calculate lattice constant of the cubic unit cell. (Answer in two decimal places)