Dioptase and Staurolite Optical Properties

Dioptase

Staurolite

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1 Optical Properties

1.1 Luster

Vitreous

Resinous

1.2 Pleochroism

Weak; dark emerald green

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

1.3 Dispersion

0.04NA

0.007 1

1.4 Transparency

TranslucentHerve Nicolas Lazzarelli

Blue Chart Gem Identification (2010) More from other references

1.5 Refractive Index

1.644-1.7201.736-1.762

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

monoclinic

1.8 Birefringence

0.051-0.0530.009-0.015

0 0.296

1.9 Clarity

TranslucentHerve Nicolas Lazzarelli

Blue Chart Gem Identification (2010) More from other references

Dioptase and Staurolite Optic Character

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

Similar to their colors, Dioptase 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, Dioptase is TranslucentHerve Nicolas Lazzarelli while Dioptase is TranslucentHerve Nicolas Lazzarelli in appearance.