Covellite and Boulder Opal Optical Properties

Covellite

Boulder Opal

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1 Optical Properties

1.1 Luster

Resinous

Not Available

1.2 Pleochroism

Marked

AbsentWalter Schumann

1.3 Dispersion

NANone

0.007 1

1.4 Transparency

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

Transparent, Translucent

1.5 Refractive Index

1.45-2.621.370-1.470

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Hexagonal

Not Available

1.8 Birefringence

Not AvailableNot Available

0 0.296

1.9 Clarity

OpaqueAnthony et al

Transparent

Covellite and Boulder Opal Optic Character

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

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