Brucite and Anthophyllite Optical Properties

Brucite

Anthophyllite

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1 Optical Properties

1.1 Luster

Vitreous, Pearly

1.2 Pleochroism

Not Available

When Fe-rich

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

TransparentMichael OâDonoghue, Gems, Sixth Edition (2006)

Transparent

1.5 Refractive Index

1.56-1.601.603-1.690

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Trigonal

Orthorhombic Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma

1.8 Birefringence

0.010-0.020Not Available

0 0.296

1.9 Clarity

TransparentMichael OâDonoghue

Transparent

Brucite and Anthophyllite Optic Character

Brucite and Anthophyllite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Brucite and Anthophyllite 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 Anthophyllite 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. Anthophyllite has Biaxial/+ character.

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Brucite and Anthophyllite Transparency

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