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Day 2 Min and Petro > Mineralogy 2 > Flashcards

Mineralogy 2 Flashcards

1
Q

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

A

2/m2/m2/m

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2
Q

Sphalerite, willemite, and smithsonite are all

A

zinc ores

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3
Q

Talc-kyanite assemblage can stabilize in

A

eclogite facies pelitic rocks

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4
Q

members of the phyllosilicate group are

A

chlorite, talc, wavellite

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5
Q

In granitic rocks composed of the ff collection of minerals: amphibolite, biotite, albite, andesine, quartz
which weather first?

A

Andesine

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6
Q

Which of the ff statements about igneous rocks is correct?
a. tholeiitic rocks are alkaline, but calc-alkaline rocks are subalkaline in nature
b. tholeiitic and calc-alkaline rocks are both subalkaline in nature
c. tholeiitic rocks are subalkaline, but calc-alkaline rocks are alkaline in nature
d. tholeiitic and calc-alkaline rocks are both alkaline in naure

A

b. tholeiitic and calc-alkaline rocks are both subalkaline in nature

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7
Q

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

A

nesosilicates

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8
Q

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

A

lithic arenite

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9
Q

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

A

feldspar

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10
Q

given the ff minerals: bastnaesite, didymium, loparite, and monazite
what elements are you looking for?

A

U

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11
Q

it is the mangnesium end -member of olivine series

A

forsterite

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12
Q

in the metamorphic reaction Quartz + Muscovite = X + Sillimanite + Water, ‘X’ represents

A

Orthoclase

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13
Q

W/c one of the ff rocks is associated with metamorphic thermal aureoles?
a. chlorite schist
b. glaucophane schist
c. amphibolite
d. hornfels

A

d. hornfels

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14
Q

W/c of the ff clay minerals contain potassium (K)?
a. kaolinite
b. illite
c. vermiculite
d. montormorillonite

A

b. illite

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15
Q

copper ores would be found in which of the following groups of minerals?
a. stannite, enargite, bornite
b. bornite, chalcocite, enargite
c. stannite, chalcocite, bastnaesite
d. cuprite, bastnaesite, bornite

A

b. 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?
a. olivine-quartz-pyroxene-orthoclase
b. olivine-pyroxene-orthoclase-quartz
c. quartz-olivine-orthoclase-pyroxene
d. quartz-orthoclase-pyroxene-olivine

A

d. quartz-orthoclase-pyroxene-olivine

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17
Q

Which one of the ff combination of reservoir and cap rock respectively, is suitable for oil accumulation?
a. sandstone-conglomerate
b. limestone-sandstone
c. shale-limestone
d. dolomite-evaporite

A

d. dolomite-evaporite

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18
Q

Which of the ff minerals is a member of the pyralpsite group of garnet minerals?
a. andradite
b. grossular
c. uvarovite
d. sepssartine

A

d. sepssartine

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19
Q

on inserting a first order interference filter in SE-NW direction, the interface figure of quartz shows
a. yellow in NE, SW quadrants and blue in NW, SE quadrants
b. yellow in NE, NW and blue in SW, SE
c. blue in NE, SW and yellow in NW, SE
d. blue in NE, NW and yellow in SW, SE

A

c. blue in NE, SW and yellow in NW, SE

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20
Q

in metafites, w/c one of teh ff mineral assemblages is stable under greenschist facies conditions?
a. andesine + biotite + hornblende
b. oligoclase + epidote + biotite + hornblende
c. albite + chlorite + actinolite + epidote
d. oligoclase + biotite + hornblende

A

c. albite + chlorite + actinolite + epidote

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21
Q

epidote, piemontite, and allanite belong to what silicate group?

A

sorosilicates

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22
Q

glaucophane schist forms in
a. subduction zones
b. pull-apart basins
c. mid-oceanic ridges
d. continental rifts

A

a. subduction zones

23
Q

the ff mienrals are polymormph of Al2SiO5, EXEPT:
a. sillimanite
b. andalusite
c. kyanite
d. fuschsite

A

d. fuschsite

24
Q

in what type of environment would you expect to find deposits of gold, platinum, and titanium?

A

placer deposits

25
Q

a siliciclastic sedimentary rock consisting predominantly of the same type of gravel-size clasts is called

A

oligomict conglomerate

26
Q

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

A

lamprophyre

27
Q

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

A

biotite

28
Q

with increasing activity of silica, the correct ORDER of appearance of minerals in a weathering environment with constant ratio of activities of K+ and H+ is
a. gibbsite-pyrorphyllite-kaolinite
b. pyrophyllite-gibbsite-kaolinite
c. gibbsite-kaolinite-pyrophyllite
d. kaolinite-gibbsite-pyrophyllite

A

c. gibbsite-kaolinite-pyrophyllite

29
Q

which one of the ff mineral shows internal reflection
a. molybdenite
b. pyrite
c. orpiment
d. magnetite

A

c. orpiment

30
Q

the reaction muscovite + quartz = k-feld + sillimanite + water takes within what facies?

A

amphibolite facies

31
Q

describes a crystal with fully-developed faces

A

euhedral

32
Q

in some volcanic rocks, large phenocrysts are usually surrounded by small crystals. this is due to

A

ostwald ripening

33
Q

a common type of twinning in plagioclase composed of alternating lamellae

A

polysynthetic twinning

34
Q

which is not a pyroxene
a. diopside
b. augite
c. orthpyroxene
d. sanidine

A

d. sanidine

35
Q

bentonite, a deposit w/c can cause problems associated with swelling in the presence of water is formed
a. by evaporation of ancient lake beds
b. from the alteration of volcanic ash
c. during a time of geologic quiescence
d. by deposition in a lagoonal environment

A

b. from the alteration of volcanic ash

36
Q

the ff minerals are cyclosilicates, except:
a. pyroxene
b. cordierite
c. axinite
d. tourmaline

A

a. pyroxene

37
Q

of the ff iron minerals, w/c is the least stable in a humid, temperature climate
a. pyrite
b. ilmenite
c. geothite
d. hematite

A

a. pyrite

38
Q

the most abundant mineral in the earth’s crust

A

plagioclase feldspar

39
Q

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

A

a. tectosilicates

40
Q

the following minerals are polymorphs of quartz, except:
a. coesite
b. cristobalite
c. stishovite
d. leucite

A

d. leucite

41
Q

used to describe a mineral having some optical properties in all dimensions

A

isotropic

42
Q

w/c of the ff is uniaxial positive
a. garnet
b. calcite
c. gold
d. quartz

A

quartz

43
Q

blueschist facies rocks are found in a metamorphic belt resulting from

A

low temp, high pressure

44
Q

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

A

orthoscopic illumination

45
Q

to observe a mineral in a thin section under XPL, what part of the microscope should you insert? assume that the lower polarizer is already inserted

A

analyzer

46
Q

standard thickness of thin section

A

30 microns

47
Q

the bright, narrow band of light that appears at the interface between the mineral an the mounting medium

A

Becke line

48
Q

silicate group that has a Si:O ratio of 4:11

A

double chain inosilicates

49
Q

w/c of the ff minerals is the least stable during the chemical weathering process in temperate climate
a. olivine
b. clay minerals
c. fe-oxides
d. quartz

A

olivine

50
Q

the chart that is used to determine orders of interference figure is called

A

Michel-Levy Chart

51
Q

the center of the cross of an interference figure is called

A

melatope

52
Q

w/c of the ff is a gem of corundum
a. sapphire
b. alexandrite
c. emerald
d. amethyst

A

sapphire

53
Q

assemblage of albite, chlorite, actinolite, and calicte would be most characteristic of what facies

A

greenschist facies

54
Q

w/c mineral is used as a n industrial substitute for asbestos?

A

wollastonite

Day 2 Min and Petro (4 decks)

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