Shigaite and Omphacite Optical Properties

Shigaite

Omphacite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Distinct

Weak: colorless -- very pale green -- very pale green

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Not Available

TranslucentAnthony et al, Handbook of mineralogy (2001)

1.5 Refractive Index

1.5461.662-1.723

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Trigonal

Not Available

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

Not Available

TranslucentAnthony et al

Shigaite and Omphacite Optic Character

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

Similar to their colors, Shigaite and Omphacite 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, Shigaite is Not Available while Shigaite is Not Available in appearance.