
Petrology Final Review
Authored by Anika Tullos
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University
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45 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Order of interference colors is based on...
Fluorescence of the mineral
Difference in refractive index in different directions through the mineral
Density
Color of the mineral in hand sample
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What do you call a mineral that is always extinct in XPL?
Opaque
Black
Isotropic
Anisotropic
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Pleochroism describes the variation of color of a mineral while rotating in...
XPL
PPL
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the optic sign of this interference figure?
Uniaxial (+)
Uniaxial (-)
Biaxial (+)
Biaxial (-)
Answer explanation
Remember, for uniaxial: BURP (Blue Upper Right Positive!)
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What kind of cleavage does olivine have?
2 planes 90º
1 plane
2 planes 60º/120º
None
Answer explanation
Olivine typically has arcuate fractures!
6.
FILL IN THE BLANK QUESTION
1 min • 1 pt
This quartz exhibits __________ extinction.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which mica (or mica-like mineral) is this? (XPL)
Lepidolite
Chlorite
Muscovite
Biotite
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