Zoisite and Dumortierite Optical Properties

Zoisite

Dumortierite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

X = pale pink to red-violet; Y = nearly colorless to bright pink or deep blue; Z = pale yellow to yellow-green

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

1.3 Dispersion

Albite Optical ..

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0.02

Rank: 19 (Overall)▶

None

Rank: N/A (Overall)▶

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Fluorite Optical Properties

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0.044 (Anglesite Opt..)

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1.4 Transparency

Transparent, Translucent, Opaque . May be translucent in thin backlit sections.

Translucent, Translucent to opaque

1.5 Refractive Index

1.685-1.707

1.669-1.723

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

1.8 Birefringence

0.006-0.018

0.011-0.037

1.9 Clarity

Transparent

Translucent

Zoisite and Dumortierite Optic Character

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

Compare Brown Gemstones

Zoisite Vs Tourmaline Bi Color

Zoisite Vs Sphene

Zoisite Vs Sunstone

Zoisite and Dumortierite Transparency

Similar to their colors, Zoisite 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, Zoisite is Opaque . May be translucent in thin backlit sections., Translucent and Transparent while Zoisite is Opaque . May be translucent in thin backlit sections., Translucent and Transparent in appearance.

Brown Gemstones

Garnet Mali

Hessonite Garnet

Idocrase

Rhodochrosite

Sphene

Sunstone