Peridot and Holmquistite Optical Properties

Peridot

Holmquistite

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1 Optical Properties

1.1 Luster

Vitreous, Greasy

Vitreous

1.2 Pleochroism

Weak: yellow-green green (colorless)Herve Nicolas Lazzarelli

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

1.3 Dispersion

0.02NA

0.007 1

1.4 Transparency

Transparent

1.5 Refractive Index

1.64-1.691.622-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Orthorhombic

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

1.8 Birefringence

0.036Not Available

0 0.296

1.9 Clarity

Transparent

Peridot and Holmquistite Optic Character

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

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