Thulite and Staurolite Optical Properties

Thulite

Staurolite

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1 Optical Properties

1.1 Luster

Vitreous

Resinous

1.2 Pleochroism

Present

X = colorless; Y = pale yellow; Z = golden yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

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

Blue Chart Gem Identification (2010) More from other references

1.5 Refractive Index

1.6951.736-1.762

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

monoclinic

1.8 Birefringence

0.006-0.0180.009-0.015

0 0.296

1.9 Clarity

OpaqueHerve Nicolas Lazzarelli

Blue Chart Gem Identification (2010) More from other references

Thulite and Staurolite Optic Character

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

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