Brookite and Dumortierite Optical Properties

Brookite

Dumortierite

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1 Optical Properties

1.1 Luster

Adamantine

Vitreous

1.2 Pleochroism

Very weak

Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Translucent, Translucent to opaque

1.5 Refractive Index

2.583-2.7411.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.1170.011-0.037

0 0.296

1.9 Clarity

Gemmological Tables (2004) More from other references

Translucent

Brookite and Dumortierite Optic Character

Brookite and Dumortierite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Brookite and Dumortierite 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 Brookite and Dumortierite 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.

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Brookite and Dumortierite Transparency

Similar to their colors, Brookite and Dumortierite 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, Brookite is Gemmological Tables (2004) More from other references while Brookite is Gemmological Tables (2004) More from other references in appearance.