1
Q
The indicatrix of anisotropic minerals Is what shape?
A
Elliptical
2
Q
Which direction is associated with a high refractive index and the maximum electric field density?
A
The slow direction.
3
Q
Which direction is associated with a low refractive index and the minimum electric field density?
A
The fast direction.
4
Q
How many optic axes do isotropic minerals have?
A
None.
5
Q
Which crystal shapes are associated with uniaxial minerals?
A
Hexagonal and tetragonal.
6
Q
What causes interference colours?
A
Retardation (difference between velocities of fast & slow rays) causes interference colours under XPL.
7
Q
What factors influence retardation?
A
The thickness of the material and the speed difference.
8
Q
How does
A
Optical Mineralogy
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