Cordierite

Iolite

Madagascar, Toliara Province (Bekily District), Beraketa

Identifier: 34405
Refractive Index: 1.5356
Specific Gravity: 2.69
Optical Character: materials.optical.Biaxial negative/positive
Pleochroism: Light yellow / Violet
Luster: Vitreous

SUN

I

F

LED

Absorption Depth

0.1

0.3

0.6

1.0

1.5

2.5

4.0

Absorption Spectrum