Demantoid and Staurolite Optical Properties

Demantoid

Staurolite

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1 Optical Properties

1.1 Luster

Adamantine

Resinous

1.2 Pleochroism

None

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

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004)

Blue Chart Gem Identification (2010) More from other references

1.5 Refractive Index

1.880-1.8901.736-1.762

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

cubic

monoclinic

1.8 Birefringence

Not Available0.009-0.015

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Blue Chart Gem Identification (2010) More from other references

Demantoid and Staurolite Optic Character

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

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Demantoid and Staurolite Transparency

Similar to their colors, Demantoid 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, Demantoid is Gemmological Tables (2004) while Demantoid is Gemmological Tables (2004) in appearance.