Staurolite and Tourmaline Optical Properties

Staurolite

Tourmaline

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1 Optical Properties

1.1 Luster

Resinous

Vitreous

1.2 Pleochroism

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

typically moderate to strong

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Blue Chart Gem Identification (2010) More from other references

Transparent, Translucent, Transparent to opaque

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

Trigonal

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 Tourmaline Optic Character

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

Similar to their colors, Staurolite and Tourmaline 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.