Esperite and Howlite Optical Properties

Esperite

Howlite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

colorless.

NilArthur Thomas

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

OpaqueAnthony et al, Opaque, Transparent

Gemmological Tables (2004) More from other references

1.5 Refractive Index

1.760-1.7741.583-1.608

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

monoclinic

1.8 Birefringence

0.0120.019

0 0.296

1.9 Clarity

OpaqueAnthony et al

Gemmological Tables (2004) More from other references

Esperite and Howlite Optic Character

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

Similar to their colors, Esperite and Howlite 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, Esperite is Opaque, OpaqueAnthony et al and Transparent while Esperite is Opaque, OpaqueAnthony et al and Transparent in appearance.