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Siderite
Siderite

Emerald
Emerald



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Siderite
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Emerald
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Optical Properties

Luster

Pearly
Vitreous

Pleochroism

-
Strong dichroism: yellow green Lazzarelli

Dispersion

0.040.01
0.005 1
👆🏻

Transparency

Transparent, Translucent
Transparent, Translucent, Transparent to translucent

Refractive Index

1.633-1.8751.565-1.602
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Trigonal
Hexagonal

Birefringence

0.2420.0040-0.0070
0 0.296
👆🏻

Clarity

Transparent
-