Corundum

Sapphire

Tanzania, Tanga Region, Umba Valley

Identifier: 33077
Refractive Index: 1.7600
Specific Gravity: 4
Optical Character: Uniaxial −
Pleochroism: Pink / Light brown
Luster: Vitreous

SUN

I

F

LED

Absorption Depth

0.1

0.3

0.6

1.0

1.5

2.5

4.0

Absorption Spectrum