Dallasite and Sinhalite Optical Properties

Dallasite

Sinhalite

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1 Optical Properties

1.1 Luster

Not Available

1.2 Pleochroism

Not Available

Trichroism: green light brown dark brownHerve Nicolas Lazzarelli

1.3 Dispersion

NA0.02

0.007 1

1.4 Transparency

Not Available

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.5401.665-1.712

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Orthorhombic

1.8 Birefringence

0.008-0.0100.036-0.042

0 0.296

1.9 Clarity

Not Available

TransparentUlrich Henn and Claudio C. Milisenda

Dallasite and Sinhalite Optic Character

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

Similar to their colors, Dallasite and Sinhalite 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, Dallasite is Not Available while Dallasite is Not Available in appearance.