Staurolite and Andalusite Optical Properties

Staurolite

Andalusite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous, Greasy

1.2 Pleochroism

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

strongly trichroic

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

1.736-1.7621.627-1.650

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Orthorhombic

1.8 Birefringence

0.009-0.0150.009-0.010

0 0.296

1.9 Clarity

Blue Chart Gem Identification (2010) More from other references

Transparent

Staurolite and Andalusite Optic Character

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

Similar to their colors, Staurolite and Andalusite 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.