Covellite and Tanzanite Optical Properties

Covellite

Tanzanite

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1 Optical Properties

1.1 Luster

Resinous

Vitreous

1.2 Pleochroism

Marked

Present

1.3 Dispersion

NA0.03

0.007 1

1.4 Transparency

OpaqueAnthony et al, Handbook of mineralogy (2001) More from other references

Transparent, Translucent, Transparent to translucent

1.5 Refractive Index

1.45-2.621.685-1.707

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Orthorhombic

1.8 Birefringence

Not Available0.006-0.018

0 0.296

1.9 Clarity

OpaqueAnthony et al

TransparentUlrich Henn and Claudio C. Milisenda

Covellite and Tanzanite Optic Character

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

Similar to their colors, Covellite and Tanzanite 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, Covellite is OpaqueAnthony et al and Handbook of mineralogy (2001) More from other references while Covellite is OpaqueAnthony et al and Handbook of mineralogy (2001) More from other references in appearance.