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Goethite
Goethite

Franklinite
Franklinite



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Goethite
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Franklinite

Optical Properties

Luster

Adamantine
-

Pleochroism

VisibleArthur Thomas
-

Dispersion

0.050.19
0.005 1
👆🏻

Transparency

-
Translucent

Refractive Index

2.26-2.398-9999
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Orthorhombic
Isometric Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m

Birefringence

0.138-9999
0 0.296
👆🏻

Clarity

-
Translucent