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Correl 2 > optical mineralogy > Flashcards

optical mineralogy Flashcards

1
Q

source of light

A

light source

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2
Q

polarizes light in one direction

A

polarizer

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3
Q

controls and illuminate light coing from the sourece

-it focuses the light in one area

A

condenser

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4
Q

controls the cone of light catering in the objective

-for relief ng minerals mo`

A

iris diaphragm

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5
Q

platform of the specimen

A

stage

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6
Q

fix the specimen on the stage

A

stage clips

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7
Q

used for centering the mineral on the stage, also used for point locations and systematic traverse of the specimen under the microscope

A

mechanical stage

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8
Q

it makes the stage go up or down

A

coarse adjustment knob

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9
Q

used for focusing image

A

fine adjustment knob

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10
Q

it holds the objectives

A

revolving nose piece

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11
Q

essential lenses of the mircoscope for magnification and resolution

A

objectives initial

4x, 10x, 20x, 40x

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12
Q

insertion slot for accessory plates

A

test plate

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13
Q

upper polarizer

A

analyzer

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14
Q

accesory plate used for observing interference figures

A

betrand lense

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15
Q

it increases retardation of a secion by about 4y

A

mica plate

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16
Q

used to determine fast and slow directions of light

A

gypsum plate

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17
Q

used to produce interference color beginning first to the end of the 3rd and 4th order

A

quartz wedge

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18
Q

light consist of particles or photons

A

corpuscular theory

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19
Q

light is transmitted by the vibration of particle in a wave

A

wave theory

christian huygens

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20
Q

considered light as waves that are electromagnetic

A

eletromagnetic theory

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21
Q

radiating oscillators in a black body radiate energy discontinuously in units called quanta

A

quantum theory

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22
Q

a perpendicular drawn to the surface of a wave front at any point of propagation of light

A

wave normal

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23
Q

locus of all the points of a medium of light

pinagsama samang wave normal

A

wave front

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24
Q

the direction which light is propagated

A

ray of light

perpendicular to the wave front

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25
Q

wave normal and the direction of propagation of the light rays are perpendicular to wave front

A

isotropic

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26
Q

light rays are not parallel to the wave nrmal

A

anisotropic

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27
Q

a curve combining movement around a circle with motion along a straight line

A

displacement

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28
Q

lies in the wave front and is perpendicular to the ray in isotropic media.
-in anisotropic media it is perpendicular only in limited directions

A

vibration direction

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29
Q

distance between two successive crests or troughs

A

wavelength

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30
Q

number of vibrations in a given unit of time

A

frequency

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31
Q

maximum displacement of a wave from the line of transmission

A

amplituted

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32
Q

the interval necessary for a wave to undergo a complete osccilation

A

period

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33
Q

the upper tip of the wave

A

crest

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34
Q

lower tip of the wave

A

trough

35
Q

a group of light waves following along a sample path

A

beam

36
Q

straight line path followed by light in moving from one point to another

A

ray

37
Q

ration of the wave normal velocity in a vacuum to wave normal velocity in medium

A

refractive index

38
Q

light of a single wavelength

A

monochromatic light

39
Q

lies parallels to the plane of the wavefront

A

light vector
isotropic - perpendicular to the direction of the propagation
anisotropic - parallels, but not perpendicular to the direction of propagation

40
Q

types of vector

A

electric and magnetic

41
Q

speed of light

A

186,284 miles per second

299,792 km per second

42
Q

combination of all the different wavelengths visible to the eye

A

wgite light

43
Q

realistic virtual image with a flat field

A

orthoscopic observation

44
Q

size of the sample

A

1 x 2 inches

45
Q

you grind the sample in a ????

A

240 - 800 mesh abrasive

46
Q

in cutting a sample you use a

A

diamond saw cutter

47
Q

thickness of a sample in a thin section

A

0.03 mm

48
Q

clean the thin section with a ?

A

xylol solution

49
Q

pandikit ng sample mo sa glass slide

A

canada balsam

50
Q

study of the interaction of light with minerals

A

optical mineralogy

51
Q

study of opaque minerals using reflected light

A

ore microscopy

52
Q

general application of optical mineralogy

A

identification of minerals

53
Q

observed with prolonged light

A

color

54
Q

change in color of a mineral in varying degrees as the stage is rotated due to differences in light absroption

A

pleochroism

55
Q

the ability of a mineral to separate into smaller particles bounded of faces of possible crystal form

A

cleavage

best explained in the terms of direction

56
Q

straight line sa wave kung saan nagsisimula ang sukat ng crest or trough

A

inflection line

57
Q

cleavage of pyroxene

A

87-93

58
Q

cleavage of amphiboles

A

124-56

59
Q

grains that show no recognisable crystal form

A

anhedral

60
Q

grains that show imperfect but recognisable crystal form

A

subhedral

61
Q

grains that show sharp and clear crystal form

A

euhedral

62
Q

degree of visibility of a transparent mineral in an imersion medium
- the contrast between a mineral and its surroundings due to diference in RI

A

relief

63
Q

R.I. of canada balsam

A

1.53

64
Q

IR of the mineral is higher than the medium

A

high relief

65
Q

RI of the mineral is lower than the medium

A

low relief

66
Q

RI of the mineral and the medium is almost the same

A

zero relief

67
Q

band or rim of light visible along a grain/crystal boundary in a plane polarized light.

A

central illumination method or becke line method

68
Q

produced because of light spli into two rays on passing trough a mineral

A

interference color

michel-levy chart

69
Q

the difference of n of the fast and slow ray

A

birefrringence

70
Q

formation of rational symmetry intergrowth of two or more grains of crystalline specie

A

twinning

71
Q

form of penetration twinning where two crystals form as penetration twins

A

carlsbad twinning

-may hati sa half

72
Q

where to adjoining slabs or lamellae are mutually reversed with respect to each other and every alternate twin or slab has an indetical atomic structure

A

lamellar twinning

  • stripes
  • plagioclase
73
Q

shows two kinds of repeated twinning i thin section, with one set of twins arrange at 90 degrees to the other set

A

cross-hatched twinning
or tartan twinning
-microcline

74
Q

solid solution which do not have uniform solution

A

zoning

75
Q

center of the mineral is more sodic becoming calcic towards the margin

A

normal zoning

76
Q

center is more calcic becoming more sodic towards the margin

A

reverse zoning

77
Q

steplike progression for more calcic interior to more sodic margins w/ local reversals in adjacent zones

A

oscillatory zoning

78
Q

when mineral become dark parallel to the crosshairs

A

parallel extinction

79
Q

mineral becoe dark at an angle

A

inclined/oblique extinction

80
Q

planes to the diagonal; vibration direction is diagonal

A

symmetrical extinction

81
Q

the arms of the uniaxial interrference figure forming a cross

A

isogyres

82
Q

interference colors, band of colors in the uniaxial interference figure

A

isochromes

83
Q

the point where the isogyres cross

A

melatope

84
Q

the identification or interpretation of framework mineralogy and textures leading to classification of wallrock as sedimentary, metamorphic, or igeous

A

petrography

Correl 2 (19 decks)

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