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Boracite
Boracite

Mottramite
Mottramite



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Boracite
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Mottramite

Boracite and Mottramite Optical Properties

Optical Properties

Luster

Vitreous, Adamantine
Greasy

Pleochroism

None
Visible X=Y= canary yellow to greenish yellow

Dispersion

-0.04
0.005 1
👆🏻

Transparency

Transparent
-

Refractive Index

1.658-1.6732.170
1 3.25
👆🏻

Optic Character

-
-

Crystal System

Orthorhombic
Orthorhombic

Birefringence

0.010-0.0110.150
0 0.296
👆🏻

Clarity

Transparent
-

Boracite and Mottramite Optic Character

Boracite and Mottramite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Boracite and Mottramite Physical Properties like crystallographic symmetry, pleochroism,etc. in the crystal. Some of the optical properties are refractive index, luster, optic character, pleochroism etc. Prominent among these is Boracite and Mottramite optic character. You might have noticed your gemologist rotating the gemstone while testing it. Rotating a gemstone along its optic axis helps in determining its optic character.

Boracite and Mottramite Transparency

Similar to their colors, Boracite and Mottramite transparency can also be used as criteria for their primary identification. Although transparency cannot be the only criteria for gemstone identification, it can efficiently used in gemstone grading. Talking about their transparency, Boracite is Transparent while Boracite is Transparent in appearance.