Microscope Skills

Question 1

plane polarized light (PPL)

Answer 1

light has been passed through a polarizer so it is all lined up. helps identify pleochrosim

Question 2

light has been passed through a polarizer so it is all lined up. helps identify pleochrosim

Answer 2

Plane Polarized light (PPL)

Question 3

pleochrosim

Answer 3

the colors a mineral exhibits under PPL, may change as you rotate the sample, not every mineral has this

Question 4

the colors a mineral exhibits under PPL, may change as you rotate the sample, not every mineral has this

Answer 4

Pleochrosim

Question 5

Cross polarized light (XPL)

Answer 5

light that has been polarized a second time after passing through the mineral, gives birefringence and extinction

Question 6

light that has been polarized a second time after passing through the mineral, gives birefringence and extinction

Answer 6

Cross polarized light (XPL)

Question 7

Birefringence

Answer 7

the color spectrum of the mineral in XPL, divided into a number of orders based on how bright the collor is.

Question 8

the color spectrum of the mineral in XPL, divided into a number of orders based on how bright the collor is.

Answer 8

Birefringence

Question 9

light extinction

Answer 9

as you rotate the sample under XPL it will ocasionaly go black, count the number of times it does this in a 360 degree rotation

Question 10

as you rotate the sample under XPL it will ocasionaly go black, count the number of times it does this in a 360 degree rotation

Answer 10

Light extinction

Question 11

cleavage on thin section

Answer 11

much easier to see

Question 12

much easier to see

Answer 12

cleavage on thin section.

Question 13

Uniaxial interference figure

Answer 13

forms a cross shape.

Question 14

forms a cross shape.

Answer 14

Uniaxial interference figure

Question 15

biaxial interference figure

Answer 15

forms a line with some amount of curve

Question 16

forms a line with some amount of curve

Answer 16

Biaxial interference figure

Question 17

motion of uniazial figure as you rotat the sample

Answer 17

the cross remains in the same orientation but travels in circles

Question 18

the cross remains in the same orientation but travels in circles

Answer 18

motion of uniaxial figure as you rotate the sample

Question 19

motion of the biaxial figure as you rotate the sample

Answer 19

the orientation of the line changes, multiple lines may cross the field of view

Question 20

the orientation of the line changes, multiple lines may cross the field of view

Answer 20

motion of the biaxial figure as you rotate the sample

Question 21

viewing the interference figure

Answer 21

set the microscope to XPL and BL

Question 22

set the microscope to XPL and BL

Answer 22

viewing the interference figure

Question 23

positive refraction in interference pattern

Answer 23

area of interest will be blue

Question 24

area of interest will be blue

Answer 24

positive refraction in interference pattern

Question 25

negative refraction in interference pattern

Answer 25

Area of interest will be orange

Question 26

Area of interest will be orange

Answer 26

negative refraction in interference pattern

Question 27

area of interest for uniaxial interference pattern

Answer 27

North east quadrent

Question 28

North east quadrent

Answer 28

area of interest for uniaxial interference pattern

Question 29

area of interest for biaxial interference pattern

Answer 29

point the more curved part of the line to the north east

Question 30

point the more curved part of the line to the north east

Answer 30

area of interest for biaxial interference pattern