Staurolite and Achroite Optical Properties

Staurolite

Achroite

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1 Optical Properties

1.1 Luster

Resinous

Not Available

1.2 Pleochroism

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

Not Available

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Blue Chart Gem Identification (2010) More from other references

Transparent, Translucent

1.5 Refractive Index

1.736-1.7621.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Not Available

1.8 Birefringence

0.009-0.0150.014-0.040

0 0.296

1.9 Clarity

Blue Chart Gem Identification (2010) More from other references

Transparent

Staurolite and Achroite Optic Character

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

Similar to their colors, Staurolite and Achroite 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.