Opal and Brucite Optical Properties

Opal

Brucite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

1.2 Pleochroism

None

Not Available

1.3 Dispersion

NoneNA

0.007 1

1.4 Transparency

Transparent, Translucent, Transparent to translucent

TransparentMichael OâDonoghue, Gems, Sixth Edition (2006)

1.5 Refractive Index

1.37-1.521.56-1.60

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

1.8 Birefringence

Not Available0.010-0.020

0 0.296

1.9 Clarity

Transparent

TransparentMichael OâDonoghue

Opal and Brucite Optic Character

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

Compare Semi Precious Gemstones

Opal Vs Lehsunia

Opal Vs Amethyst

Opal Vs Alexandrite

Opal and Brucite Transparency

Similar to their colors, Opal and Brucite 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, Opal is Translucent, Transparent and Transparent to translucent while Opal is Translucent, Transparent and Transparent to translucent in appearance.