Euclase and Prehnite Optical Properties

Euclase

Prehnite

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1 Optical Properties

1.1 Luster

Vitreous

1.2 Pleochroism

Weak: colorless-(greenish) yellow

AbsentWalter Schumann

1.3 Dispersion

0.02None

0.007 1

1.4 Transparency

Gemmological Tables (2004) More from other references

Translucent

1.5 Refractive Index

1.650-1.6771.611-1.673

1 3.25

1.6 Optic Character

Not Available

1.7 Crystal System

Monoclinic Prismatic H-M Symbol (2/m) Space Group: P 21/a

Orthorhombic

1.8 Birefringence

0.019-0.0250.021-0.033

0 0.296

1.9 Clarity

TransparentUlrich Henn and Claudio C. Milisenda

TranslucentHerve Nicolas Lazzarelli

Euclase and Prehnite Optic Character

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

Similar to their colors, Euclase and Prehnite 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, Euclase is Gemmological Tables (2004) More from other references while Euclase is Gemmological Tables (2004) More from other references in appearance.