Brucite and Sillimanite Optical Properties

Brucite

Sillimanite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Vitreous, Subadamantine, Silky

1.2 Pleochroism

Not Available

Colourless to pale brown to yellow

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TransparentMichael OâDonoghue, Gems, Sixth Edition (2006)

Transparent, Translucent

1.5 Refractive Index

1.56-1.601.653-1.685

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Orthorhombic

1.8 Birefringence

0.010-0.0200.020-0.022

0 0.296

1.9 Clarity

TransparentMichael OâDonoghue

Transparent

Brucite and Sillimanite Optic Character

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

Similar to their colors, Brucite 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, Brucite is Gems, Sixth Edition (2006) and TransparentMichael OâDonoghue while Brucite is Gems, Sixth Edition (2006) and TransparentMichael OâDonoghue in appearance.