Ettringite and Inderite Optical Properties

Ettringite

Inderite

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1 Optical Properties

1.1 Luster

Vitreous

Vitreous, Pearly, Greasy

1.2 Pleochroism

Not Available

1.3 Dispersion

NANA

0.007 1

1.4 Transparency

Transparent, Translucent

Gemmological Tables (2004)

1.5 Refractive Index

1.470-1.4911.488-1.505

1 3.25

1.6 Optic Character

Not Available

Biaxial/+

1.7 Crystal System

Trigonal

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

1.8 Birefringence

0.0210.017

0 0.296

1.9 Clarity

Transparent

TransparentUlrich Henn and Claudio C. Milisenda

Ettringite and Inderite Optic Character

Ettringite and Inderite optical properties play a significant role while distinguishing these gemstones from each other. These properties are influenced by the Ettringite and Inderite 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 Ettringite and Inderite 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. Inderite has Biaxial/+ character.

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Ettringite and Inderite Transparency

Similar to their colors, Ettringite and Inderite 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, Ettringite is Translucent and Transparent while Ettringite is Translucent and Transparent in appearance.