Anhydrite and Staurolite Optical Properties

Anhydrite

Staurolite

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1 Optical Properties

1.1 Luster

Pearly, Greasy

Resinous

1.2 Pleochroism

For violet varieties

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

1.3 Dispersion

0.01NA

0.007 1

1.4 Transparency

Transparent

Blue Chart Gem Identification (2010) More from other references

1.5 Refractive Index

1.570-1.6141.736-1.762

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

monoclinic

1.8 Birefringence

0.042-0.0440.009-0.015

0 0.296

1.9 Clarity

Transparent

Blue Chart Gem Identification (2010) More from other references

Anhydrite and Staurolite Optic Character

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

Compare Blue Gemstones

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Anhydrite and Staurolite Transparency

Similar to their colors, Anhydrite 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, Anhydrite is Transparent while Anhydrite is Transparent in appearance.