Boulder Opal and Dravite Optical Properties

Boulder Opal

Dravite

Add ⊕

1 Optical Properties

1.1 Luster

Not Available

Vitreous

1.2 Pleochroism

AbsentWalter Schumann

Very strong: pale yellow colorless

1.3 Dispersion

None0.02

0.007 1

1.4 Transparency

Transparent, Translucent

Transparent

1.5 Refractive Index

1.370-1.4701.614-1.666

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Not Available

Trigonal Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

1.8 Birefringence

Not Available0.014-0.032

0 0.296

1.9 Clarity

Transparent

Boulder Opal and Dravite Optic Character

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

Compare Blue Gemstones

Boulder Opal Vs Chrysocolla

Boulder Opal Vs Chrome-Chalcedony

Boulder Opal Vs Chrome Tourmaline

Boulder Opal and Dravite Transparency

Similar to their colors, Boulder Opal and Dravite 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, Boulder Opal is Translucent and Transparent while Boulder Opal is Translucent and Transparent in appearance.