Staurolite and Allanite Optical Properties

Staurolite

Allanite

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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

NANA

0.007 1

1.4 Transparency

Blue Chart Gem Identification (2010) More from other references

Not Available

1.5 Refractive Index

1.736-1.7621

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

Not Available

1.8 Birefringence

0.009-0.0150.013-0.036

0 0.296

1.9 Clarity

Blue Chart Gem Identification (2010) More from other references

Not Available

Staurolite and Allanite Optic Character

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

Similar to their colors, Staurolite and Allanite 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.