Brucite and Dumortierite Optical Properties

Brucite

Dumortierite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

Vitreous

1.2 Pleochroism

Not Available

Strong; X = deep blue or violet; Y = yellow to red-violet or nearly colorless; Z = colorless or very pale blue

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

TransparentMichael OâDonoghue, Gems, Sixth Edition (2006)

Translucent, Translucent to opaque

1.5 Refractive Index

1.56-1.601.669-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Orthorhombic

1.8 Birefringence

0.010-0.0200.011-0.037

0 0.296

1.9 Clarity

TransparentMichael OâDonoghue

Translucent

Brucite and Dumortierite Optic Character

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

Similar to their colors, Brucite and Dumortierite 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.