Optical Properties of Biotite

Biotite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

1.2 Pleochroism

Strong

1.3 Dispersion

Not Available

Rank: N/A (Overall) ▶

0.007 1

1.4 Transparency

Not Available

1.5 Refractive Index

1.565-1.625

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

1.8 Birefringence

0.03-0.07

0 0.296

1.9 Clarity

Not Available

Biotite Luster

Optical Properties of Biotite are its behavioral responses towards light. While few optical properties can be identified with naked eyes, other require special instruments by the gemologists to identify them. Biotite optical properties like luster, clarity, refractive index etc. are used to determine the non-destructive methods during gemstone identification and evaluation.

Biotite luster is the quantity of light the crystal reflects when light is incident on it. Biotite which is commonly found in Brown, Yellow, White, Brown, Greenish, Yellow, White color, It possess Pearly and Vitreous luster.

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Biotite Refractive Index

Optical properties of a Biotite crystal are responsive to the small changes in composition and strain within its crystalline structure. Absolute diligence is therefore necessary during cutting and polishing of the gemstone. All such optical properties are majorly influenced by Physical Properties of Biotite.

As we are well aware, refractive index is the phenomenon which is related to bending of light through a medium (crystal). It is used in qualitative analysis of gemstones by gemologists Besides, few gemstones exhibit property of dual refractive indices. This dual nature is known as Birefringence. The value of Biotite refractive index is 1.565-1.625. Birefringence value for this gem is 0.03-0.07. So if you are searching for prominent Yellow Gemstones, Biotite gem is something not miss on, since it has been a favorite pick in the gem wearing community.

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