Brookite and Foitite Optical Properties

Brookite

Foitite

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1 Optical Properties

1.1 Luster

Adamantine

Vitreous

1.2 Pleochroism

Very weak

Strong: pale lavender dark blueAnthony et al

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

TranslucentAnthony et al, Translucent

1.5 Refractive Index

2.583-2.741Not Available

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

1.8 Birefringence

0.117Not Available

0 0.296

1.9 Clarity

Gemmological Tables (2004) More from other references

TranslucentAnthony et al

Brookite and Foitite Optic Character

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

Similar to their colors, Brookite and Foitite 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, Brookite is Gemmological Tables (2004) More from other references while Brookite is Gemmological Tables (2004) More from other references in appearance.