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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
wave normal and the direction of propagation of the light rays are perpendicular to wave front
isotropic
26
light rays are not parallel to the wave nrmal
anisotropic
27
a curve combining movement around a circle with motion along a straight line
displacement
28
lies in the wave front and is perpendicular to the ray in isotropic media. -in anisotropic media it is perpendicular only in limited directions
vibration direction
29
distance between two successive crests or troughs
wavelength
30
number of vibrations in a given unit of time
frequency
31
maximum displacement of a wave from the line of transmission
amplituted
32
the interval necessary for a wave to undergo a complete osccilation
period
33
the upper tip of the wave
crest
34
lower tip of the wave
trough
35
a group of light waves following along a sample path
beam
36
straight line path followed by light in moving from one point to another
ray
37
ration of the wave normal velocity in a vacuum to wave normal velocity in medium
refractive index
38
light of a single wavelength
monochromatic light
39
lies parallels to the plane of the wavefront
light vector isotropic - perpendicular to the direction of the propagation anisotropic - parallels, but not perpendicular to the direction of propagation
40
types of vector
electric and magnetic
41
speed of light
186,284 miles per second | 299,792 km per second
42
combination of all the different wavelengths visible to the eye
wgite light
43
realistic virtual image with a flat field
orthoscopic observation
44
size of the sample
1 x 2 inches
45
you grind the sample in a ????
240 - 800 mesh abrasive
46
in cutting a sample you use a
diamond saw cutter
47
thickness of a sample in a thin section
0.03 mm
48
clean the thin section with a ?
xylol solution
49
pandikit ng sample mo sa glass slide
canada balsam
50
study of the interaction of light with minerals
optical mineralogy
51
study of opaque minerals using reflected light
ore microscopy
52
general application of optical mineralogy
identification of minerals
53
observed with prolonged light
color
54
change in color of a mineral in varying degrees as the stage is rotated due to differences in light absroption
pleochroism
55
the ability of a mineral to separate into smaller particles bounded of faces of possible crystal form
cleavage | best explained in the terms of direction
56
straight line sa wave kung saan nagsisimula ang sukat ng crest or trough
inflection line
57
cleavage of pyroxene
87-93
58
cleavage of amphiboles
124-56
59
grains that show no recognisable crystal form
anhedral
60
grains that show imperfect but recognisable crystal form
subhedral
61
grains that show sharp and clear crystal form
euhedral
62
degree of visibility of a transparent mineral in an imersion medium - the contrast between a mineral and its surroundings due to diference in RI
relief
63
R.I. of canada balsam
1.53
64
IR of the mineral is higher than the medium
high relief
65
RI of the mineral is lower than the medium
low relief
66
RI of the mineral and the medium is almost the same
zero relief
67
band or rim of light visible along a grain/crystal boundary in a plane polarized light.
central illumination method or becke line method
68
produced because of light spli into two rays on passing trough a mineral
interference color | michel-levy chart
69
the difference of n of the fast and slow ray
birefrringence
70
formation of rational symmetry intergrowth of two or more grains of crystalline specie
twinning
71
form of penetration twinning where two crystals form as penetration twins
carlsbad twinning | -may hati sa half
72
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
lamellar twinning - stripes - plagioclase
73
shows two kinds of repeated twinning i thin section, with one set of twins arrange at 90 degrees to the other set
cross-hatched twinning or tartan twinning -microcline
74
solid solution which do not have uniform solution
zoning
75
center of the mineral is more sodic becoming calcic towards the margin
normal zoning
76
center is more calcic becoming more sodic towards the margin
reverse zoning
77
steplike progression for more calcic interior to more sodic margins w/ local reversals in adjacent zones
oscillatory zoning
78
when mineral become dark parallel to the crosshairs
parallel extinction
79
mineral becoe dark at an angle
inclined/oblique extinction
80
planes to the diagonal; vibration direction is diagonal
symmetrical extinction
81
the arms of the uniaxial interrference figure forming a cross
isogyres
82
interference colors, band of colors in the uniaxial interference figure
isochromes
83
the point where the isogyres cross
melatope
84
the identification or interpretation of framework mineralogy and textures leading to classification of wallrock as sedimentary, metamorphic, or igeous
petrography

Correl 2 (19 decks)

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