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Correlation Course > Mineralogy > Flashcards

Mineralogy Flashcards

1
Q

The symmetry elements of a point group are: 3 crystallographic axes of 2-fold symmetry and 3 mirror planes perpendicular to the crystallographic axes. The Hermann-Mauguin notation of the group is:

  • 2/m
  • 2/m2/m2/m
  • 2mm
  • 2m2m2m
A
  • 2/m2/m2/m
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2
Q

Sphalerite, willemite, and smithsonite are all

  • tin ores
  • chromium ores
  • zinc ores
  • lead ores
A
  • zinc ores
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3
Q

The talc-kyanite assemblage can stabilize in

  • amphibolite facies mafic rocks
  • eclogite facies pelitic rocks
  • greenschist facies marly rocks
  • sanidinite facies ultramafic rocks
A
  • eclogite facies pelitic rocks
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4
Q

Members of the phyllosilicate group are

  • biotite, talc, barite
  • kaolinite, muscovite, chlorite
  • chlorite, talc, wavellite
  • staurolite, zeolite, sphalerite
A
  • kaolinite, muscovite, chlorite
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5
Q

In a granitic rock composed of the following collection of minerals: Amphibolite, biotite, albite, andesine, and quartz, which weather first?

  • quartz
  • biotite
  • andesine
  • oligoclase
A
  • andesine
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6
Q

Which of the following statements about igneous rocks is correct?

  • tholeiitic rocks are alkaline, but calc-alkaline rocks are sub-alkaline in nature.
  • tholeiitic and calc-alkaline rocks are both sub-alkaline in nature.
  • tholeiitic rocks are sub-alkaline, but calc-alkaline rocks are alkaline in nature
  • tholeiitic and calc-alkaline rocks are both alkaline in nature
A
  • tholeiitic and calc-alkaline rocks are both sub-alkaline in nature.
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7
Q

The ratio of bridging to non-bridging oxygen atoms is zero in the case of

  • tectosilicates
  • phyllosilicates
  • inosilicates
  • nesosilicates
A

nesosilicates

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8
Q

A siliciclastic sedimentary rock with <5% matrix and QFL composition of 60% quartz, 30% rock fragments and 10% feldspar, is called:

  • quartz wacke
  • feldspathic wacke
  • quartz arenite
  • lithic arenite
A
  • lithic arenite
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9
Q

Which mineral family produces the most clay minerals during weathering processes?

  • calcite
  • pyroxene
  • mica
  • feldspar
A
  • feldspar
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10
Q

Given the following minerals, bastnaesite, didymium, loparite, and monazite, what elements are you looking for?

  • Cu
  • Ni
  • REE
  • U
A
  • U
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11
Q

It is the magnesium end-member of the olivine series.
- Forsterite
- Fayalite
- Monticellite
- Bytownite

A

Forsterite

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12
Q

In the metamorphic reaction quartz + muscovite = X + sillimanite + water, ‘X’ represents

  • orthoclase
  • staurolite
  • garnet
  • cordierite
A
  • orthoclase
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13
Q

Which one of the following rocks are associated with metamorphic thermal aureoles?

  • chlorite schist
  • glaucophane schist
  • amphibolite
  • hornfels
A
  • hornfels
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14
Q

Which of the following clay minerals contain potassium (K)?

  • kaolinite
  • illite
  • vermiculite
  • montmorillonite
A
  • illite
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15
Q

Copper ores would be found in which of the following groups of minerals?

  • stannite, ennargite, bornite
  • bornite, chalcocite, enargite
  • stannite, chalcocite, bastnaesite
  • cuprite, bastnaesite, bornite
A
  • bornite, chalcocite, enargite
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16
Q

Which of the following clay sequences of minerals CORRECTLY list an increasing rate of dissolution during chemical weathering?

  • olivine-quartz-pyroxene-orthoclase
  • olivine-pyroxene-orthoclase-quartz
  • quartz-olivine-orthoclase-pyroxene
  • quartz-orthoclase-pyroxene-olivine
A
  • quartz-orthoclase-pyroxene-olivine
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17
Q

Which one of the following combination of reservoir and cap rock respectively is suitable for oil accumulation

  • sandstone-conglomerate
  • limestone-sandstone
  • shale-limestone
  • dolomite-evaporite
A
  • dolomite-evaporite
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18
Q

Which of the following minerals is a member of the pyralspite group of garnet minerals?

  • andradite
  • grossular
  • uvarovite
  • spessartine
A
  • spessartine
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19
Q

On inserting a first-order interference filter in the SE-NW direction, the interference figure of quartz shows

  • yellow in NE, SW quadrants and blue in NW, SE quadrants
  • yellow in NE, NW quadrants and blue in SW, SE quadrants
  • blue in NE, SW quadrants and yellow in NW, SE quadrants
  • blue in NE, NW quadrants and yellow in SW, SE quadrants
A
  • blue in NE, SW quadrants and yellow in NW, SE quadrants
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20
Q

In metafites, which of the following mineral assemblages is stable under greenschist facies conditions?

  • andesine + biotite + hornblende
  • oligoclase + epidote + biotite + hornblende
  • albite + chlorite + actinolite + epidote
  • oligoclase + biotite + hornblende
A
  • albite + chlorite + actinolite + epidote
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21
Q

Epidote, peimontite, and allanite belong to what silicate group?

  • nesosilicates
  • sorosilicates
  • tectosilicates
  • inosilicates
A
  • sorosilicates
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22
Q

Glaucophane schist forms in

  • subduction zones
  • pull-apart basins
  • mid-ocean ridges
  • continental rifts
A
  • subduction zones
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23
Q

The following minerals are polymorphs of Al2SiO5, EXCEPT:

  • sillimanite
  • andalusite
  • kyanite
  • fuchsite
A
  • fuchsite
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24
Q

In what type of environment would you except to find deposits of gold, platinum, and titanium?

  • weathering deposits
  • epithermal deposits
  • placer deposits
  • volcanic deposits
A
  • placer deposits
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25
Q

A siliciclastic sedimentary rock consisting predominantly of the same type of gravel-size clast is called

  • arkose
  • oligomict conglomerate
  • polymict conglomerate
  • petromict conglomerate
A
  • oligomict conglomerate
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26
Q

A melanocratic porphyritic rock containing phenocrysts of biotite, with feldspar restricted to the groundmass, is called

  • dacite
  • andesite
  • trachyte
  • lamprophyre
A
  • lamprophyre
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27
Q

Surface exposure, in a temperate climate of aluminum silicate minerals such as feldspar would result in the development of

  • biotite
  • kaolinite
  • bentonite
  • montmorillonite
A
  • biotite
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28
Q

With the increasing activity of silica, the CORRECT order of appearance of minerals in a weathering environment with a constant ratio of activities of K+ and H+ is

  • gibbsite-pyrophyllite-kaolinite
  • pyrophyllite-gibbsite-kaolinite
  • gibbsite-kaolinite-pyrophyllite
  • kaolinite-gibbsite-pyrophyllite
A
  • gibbsite-kaolinite-pyrophyllite
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29
Q

Which one of the following ore minerals shows internal reflection?

  • molybdenite
  • pyrite
  • orpiment
  • magnetite
A
  • orpiment
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30
Q

The reaction muscovite + quartz = K-feldspar + sillimanite + water takes place within the

  • eclogite facies
  • amphibolite facies
  • greenschist facies
  • granulite facies
A
  • amphibolite facies
31
Q

Describe a crystal with fully-developed faces.

  • anhedral
  • euhedral
  • amorphous
  • subhedral
A
  • euhedral
32
Q

In some volcanic rocks, large phenocrysts are usually surrounded by small crystals. This observation is due to

  • ostwald ripening
  • defects
  • zoning
  • twinning
A
  • ostwald ripening
33
Q

A common type of twinning in plagioclase composed of alternating lamellae

  • cyclic twinning
  • contact twinning
  • polysynthetic twinning
  • penetration twinning
A
  • polysynthetic twinning
34
Q

Which of the following is NOT a pyroxene?

  • diopside
  • augite
  • orthopyroxene
  • sanidine
A
  • sanidine
35
Q

Bentonite, a deposit which can cause problems associated with swelling in the presence of water is formed

  • by evaporation of ancient lake beds
  • from the alteration of volcanic ash
  • during a time of geologic quiescence
  • by deposition in a lagoonal environment
A
  • from the alteration of volcanic ash
36
Q

The following minerals are cyclosilicates, EXCEPT:

  • pyroxene
  • cordierite
  • axinite
  • tourmaline
A
  • pyroxene
37
Q

Of the following iron minerals, which is the least stable in a humid, temperate climate?

  • pyrite
  • ilmenite
  • goethite
  • hematite
A
  • pyrite
38
Q

The most abundant minerals in the Earth’s crust

  • quartz
  • plagioclase feldspar
  • pyroxene
  • alkali feldspar
A
  • plagioclase feldspar
39
Q

Subclass of silicate group characterized by Si:O ratio of 1:2

  • tectosilicate
    -inosilicate
  • phyllosilicate
  • cyclosilicate
A
  • tectosilicate
40
Q

The following minerals are polymorphs of quartz, EXCEPT:

  • coesite
  • cristobalite
  • stishovite
  • leucite
A
  • leucite
41
Q

Used to describe a mineral having the same optical properties in all dimensions

  • uniaxial
  • anisotropic
  • isotropic
  • biaxial
A
  • isotropic
42
Q

Which of the following mineral is uniaxial positive?

  • garnet
  • calcite
  • gold
  • quartz
A
  • quartz
43
Q

Blueschist facies rocks are found in a metamorphic belt resulting from

  • high temperature, low pressure
  • low temperature, high pressure
  • high temperature, high pressure
  • high temperature, low pressure
A
  • low temperature, high pressure
44
Q

A type of optical path where light travels straight from the source to the ocular.

  • XPL
  • orthoscopic illumination
  • PPL
  • conoscopic illumination
A
  • orthoscopic illumination
45
Q

To observe minerals in thin sections under XPL, which of the following parts of the microscope should you insert? Assume that the lower polarizer is already inserted.

  • auxiliary condenser
  • accessory plate
  • analyzer
  • Bertrand lens
A
  • analyzer
46
Q

What is the standard thickness of the thin section?

  • 30 microns
  • 40 microns
  • 50 microns
  • 60 microns
A
  • 30 microns
47
Q

The bright, narrow band of light that appears at the interface between the mineral and the mounting medium.

  • Bertrand line
  • Snell’s line
  • Michel-Levy line
  • Becke line
A
  • Michel-Levy line
48
Q

Which of the following silicate group has a Si:O of 4:11?

  • double chain inosilicates
  • sorosilicates
  • phyllosilicates
  • nesosilicates
A
  • double chain inosilicates
49
Q

Which of the following minerals is the least stable during the chemical weathering process in a temperate climate?

  • olivine
  • clay minerals
  • fe-oxides
  • quartz
A
  • olivine
50
Q

The chart that is used to determine orders of interference color

  • none of the above
  • snell chart
  • michel-levy chart
  • becke chart
A
  • michel-levy chart
51
Q

The center of the cross of an interference figure is called

  • isogyre
  • melatope
  • isochrome
  • extinction
A
  • melatope
52
Q

Which of the following is a gem of corundum?

  • sapphire
  • alexandite
  • emerald
  • amethyst
A
  • sapphire
53
Q

The assemblage of albite, chlorite, actinolite, and calcite would be most characteristics of the

  • amphibolite facies
  • blueschist facies
  • sanidinite facies
  • greenschist facies
A
  • greenschist facies
54
Q

Which mineral is used as an industrial substitute for asbestos?

  • wolframite
  • wollastonite
  • wulfenite
  • wurtzite
A
  • wollastonite
55
Q

The second most abundant oxide in the Earth’s crust is

  • Al2O3
  • SiO2
  • CaO
  • Na2O
A
  • Al2O3
56
Q

Which one of the following minerals have isolated (SiO4)^4 tetrahedra linked by divalent cations in octahedral coordination?

  • Muscovite
  • Beryl
  • Quartz
  • Olivine
A

Olivine

57
Q

The texture is characterized by exsolved lamellae of albite in K-feldspar known as?

  • myrmekite
  • graphic
  • perthite
  • antiperthite
A
  • perthite
58
Q

Fissility is best shown by

  • sandstone
  • shale
  • siltstone
  • limestone
A
  • shale
59
Q

Among the following, the mineral showing acicular habit is

  • kyanite
  • tourmaline
  • biotite
  • silimanite
A
  • silimanite
60
Q

Also known as “blue asbestos”

  • amosite
  • anthophyllite
  • chrysotile
  • crocidolite
A
  • crocidolite
61
Q

The hardest mineral (with exception of diamond) in the Moh’s scale of hardness is

  • an oxide
  • a silicate
  • a phosphate
  • a carbonate
A
  • an oxide
62
Q

Which one of the following optical properties of minerals is NOT observed under crossed nicols?

  • extinction
  • interference color
  • interference figure
  • pleochroism
A
  • pleochroism
63
Q

A becke line test is performed on an unknown mineral surrounded by grains of anorthite (n= 1.585) and tremolite (n=1.62). The Becke line moves towards the center of the unknown mineral grain along the boundaries where it is in contact with anorthite, but moves outside of the grain boundary where it is in contact with tremolite. What has been determined about the refractive index of the unknown mineral?

  • the unknown mineral has a refractive index that is greater that 1.62
  • the unknown mineral has a refractive index that is less than 1.585
  • the unknown mineral has a refractive index between 1.585 and 1.62
A
  • the unknown mineral has a refractive index between 1.585 and 1.62
64
Q

The birefringence of a uniaxial mineral having refractive indices of 1.658 and 1.486 is

  • 1.572
  • 0.172
  • 0.086
  • 1.000
A
  • 0.172
65
Q

Iceland spar is also called transparent

  • quartz
  • gypsum
  • calcite
  • diamond
A
  • calcite
66
Q

Minerals belonging to the following crystals system are anisotropic, EXCEPT:

  • monoclinic
  • triclinic
  • hexagonal
  • isometric
A
  • isometric
67
Q

In double refraction, light is split into two rays, namely:

  • primary and secondary rays
  • ordinary and extraordinary rays
  • polarized and cross-polarized rays
  • reflected and refracted rays
A
  • ordinary and extraordinary rays
68
Q

Identify the mineral which has specific gravity of >5, hardness <3 and gives grey streak

  • barite
  • sphalerite
  • graphite
  • galena
A
  • galena
69
Q

The following minerals have metallic/submetallic luster, EXCEPT:

  • graphite
  • sphalerite
  • rutile
  • hematite
A
  • rutile
70
Q

Which of the following minerals does not show the phenomenon of double refraction?

  • quartz
  • fluorite
  • calcite
  • apatite
A
  • fluorite
71
Q

Which of the following minerals is a good conductor of electricity, besides being strongly magnetic

  • pyrite
  • cuprite
  • pyrrhotite
  • sphalerite
A
  • pyrrhotite
72
Q

A rock described as argillaceous

  • contains flattened pebbles
  • is clay-rich
  • displays a satin luster
  • is composed of coarse mica
A
  • is clay-rich
73
Q

Which of the following represents a closed form?

  • tetragonal prism
  • dihexagonal pyramid
  • dome
  • trigonal dipyramid
A
  • trigonal dipyramid

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