Catapleiite and Sillimanite Optical Properties

Catapleiite

Sillimanite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Subadamantine, Silky

1.2 Pleochroism

Not Available

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TransparentUlrich Henn and Claudio C. Milisenda, Gemmological Tables (2004)

Transparent, Translucent

1.5 Refractive Index

1.590-1.6291.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: B2/b (pseudo-HEX)

Orthorhombic

1.8 Birefringence

0.0390.020-0.022

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

Transparent

Catapleiite and Sillimanite Optic Character

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

Similar to their colors, Catapleiite and Sillimanite 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, Catapleiite is Gemmological Tables (2004) and TransparentUlrich Henn and Claudio C. Milisenda while Catapleiite is Gemmological Tables (2004) and TransparentUlrich Henn and Claudio C. Milisenda in appearance.