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Staurolite
Staurolite

Iolite
Iolite



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Staurolite
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Iolite

Staurolite and Iolite Optical Properties

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1 Optical Properties
1.1 Luster
Resinous
Vitreous
1.2 Pleochroism
X = colorless; Y = pale yellow; Z = golden yellow
Not Available
1.3 Dispersion
Albite Optical ..
Not Available
Rank: N/A (Overall)
Not Available
Rank: N/A (Overall)
Fluorite Optical Properties
1.4 Transparency
Blue Chart Gem Identification (2010) More from other references
Transparent, Translucent, Transparent to translucent
1.5 Refractive Index
1.736-1.762
1.52-1.56
1.6 Optic Character
Not Available
Not Available
1.7 Crystal System
monoclinic
Orthorhombic
1.8 Birefringence
0.009-0.015
Not Available
1.9 Clarity
Blue Chart Gem Identification (2010) More from other references
Transparent to translucent

Staurolite and Iolite Optic Character

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

Staurolite and Iolite Transparency

Similar to their colors, Staurolite and Iolite 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, Staurolite is Blue Chart Gem Identification (2010) More from other references while Staurolite is Blue Chart Gem Identification (2010) More from other references in appearance.