Staurolite and Dioptase Optical Properties

Staurolite

Dioptase

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1 Optical Properties

1.1 Luster

Resinous

Vitreous

1.2 Pleochroism

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

Weak; dark emerald green

1.3 Dispersion

NA0.04

0.007 1

1.4 Transparency

Blue Chart Gem Identification (2010) More from other references

TranslucentHerve Nicolas Lazzarelli

1.5 Refractive Index

1.736-1.7621.644-1.720

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Trigonal

1.8 Birefringence

0.009-0.0150.051-0.053

0 0.296

1.9 Clarity

Blue Chart Gem Identification (2010) More from other references

TranslucentHerve Nicolas Lazzarelli

Staurolite and Dioptase Optic Character

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

Similar to their colors, Staurolite and Dioptase 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.