1:14:11

Optics of Anisotropic Minerals

27:44

Optical Mineralogy Pt.1- Plane & Cross Polarized Light, Birefringence, Pleochroism, etc. | GEO GIRL

10:07

Mineral Habit

7:01

Uniaxial and Isotropic Optics (and birefringence in uniaxial minerals)

20:16

5 Birefringence

9:32

Mineral Identification - Hardness

1:11

143 Birefringence: Double Refraction

7:55

Cleavage and Fracture