Holmquistite and Star Sapphire Optical Properties

Holmquistite

Star Sapphire

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1 Optical Properties

1.1 Luster

Vitreous

Not Available

1.2 Pleochroism

Strong in shades of violet when dark-colored.Anthony et al

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent

Transparent, Translucent

1.5 Refractive Index

1.622-1.6661.758-1.780

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

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

Not Available

1.8 Birefringence

Not Available0.007-0.010

0 0.296

1.9 Clarity

Transparent

Holmquistite and Star Sapphire Optic Character

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

Similar to their colors, Holmquistite and Star Sapphire 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, Holmquistite is Transparent while Holmquistite is Transparent in appearance.